# Classifying Equations of Parallel and Perpendicular Lines

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1 CONCEPT DEVELOPMENT Mathematics Assessment Project CLASSROOM CHALLENGES A Formative Assessment Lesson Classifying Equations of Parallel and Perpendicular Lines Mathematics Assessment Resource Service University of Nottingham & UC Berkeley For more details, visit: MARS, Shell Center, University of Nottingham May be reproduced, unmodified, for non-commercial purposes under the Creative Commons license detailed at - all other rights reserved

2 Classifying Equations of Parallel and Perpendicular Lines MATHEMATICAL GOALS This lesson unit is intended to help you assess how well students understand the relationship between the slopes of parallel and perpendicular lines and in particular, to help identify students who find it difficult to: Find, from their equations, lines that are parallel and perpendicular. Identify and use intercepts. It also aims to encourage discussion on some common misconceptions about equations of lines. COMMON CORE STATE STANDARDS This lesson relates to the following Standards for Mathematical Content in the Common Core State Standards for Mathematics: G-PE: Use coordinates to prove simple geometric theorems algebraically. F-IF: Analyze functions using different representations. This lesson also relates to all the Standards for Mathematical Practice in the Common Core State Standards for Mathematics, with a particular emphasis on Practices 2, 5, and 7: 1. Make sense of problems and persevere in solving them. 2. Reason abstractly and quantitatively. 3. Construct viable arguments and critique the reasoning of others. 4. Model with mathematics. 5. Use appropriate tools strategically. 6. Attend to precision. 7. Look for and make use of structure. 8. Look for and express regularity in repeated reasoning. INTRODUCTION The lesson unit is structured in the following way: Before the lesson, students work individually on a task designed to reveal their current level of understanding and their difficulties. You then review their work and create questions for students to answer in order to improve their solutions. During the lesson, students work in small groups on a related task, justifying and explaining their decisions to each other. They then re-group to critique each other s work. Finally, in a wholeclass discussion, students explain and extend their methods and solutions. In a follow-up lesson, students work alone to improve their solutions to the assessment task. MATERIALS REQUIRED Each student will need two copies of Parallel and Perpendicular Lines, a mini-whiteboard, pen, and eraser. Each small group of students will need the Card Set: Equations (already cut up into cards), two copies of the Properties table, and a glue stick. Graph paper should be kept in reserve and only used when requested. There is a projector resource to help introduce activities and support the whole-class discussion. TIME NEEDED Approximately 15 minutes before the lesson, a 1-hour lesson, and 15 minutes in a follow-up lesson. Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-1

3 BEFORE THE LESSON Assessment task: Parallel and Perpendicular Lines (15 minutes) Have students do this task, in class or for homework, a day or more before the formative assessment lesson. This will give you an opportunity to assess the work and to find out the kinds of difficulties students have with it. You should then be able to target your help more effectively in the subsequent lesson. Give each student a copy of the assessment task Parallel and Perpendicular Lines. Read through the questions and try to answer them as carefully as you can. It is important that, as far as possible, students are allowed to answer the questions without your assistance. Advise your students that they should not worry too much if they cannot understand or do everything, because there will be a lesson using a similar task 2010 Shell Center/MARS University of Nottingham UK S-1 that will help them. Explain that their goal is to be able to answer questions such as these by the end of the next lesson. Assessing students responses Collect students responses to the task. Make some notes on what their work reveals about their current levels of understanding. The purpose of doing this is to forewarn you of the difficulties students will experience during the lesson itself, so that you may prepare carefully. We suggest that you do not score students work. The research shows that this will be counterproductive, as it will encourage students to compare their scores and will distract their attention from what they can do to improve their mathematics. Instead, help students to make further progress by summarizing their difficulties as a series of questions. Some suggestions for these are given in the Common issues table on the next page. These have been drawn from common difficulties observed in trials of this lesson unit. We suggest you make a list of your own questions, based on your students work. We recommend you either: write one or two questions on each student s work, or Finding Equations of Parallel & Perpendicular Lines Student Materials Alpha Version 7 Jan 2010 give each student a printed version of your list of questions and highlight the questions for each individual student. If you do not have time to do this, you could select a few questions that will be of help to the majority of students and write these on the board when you return the work to the students in the follow-up lesson.! Parallel and Perpendicular Lines Here are some equations of straight lines: y + 2x = 8 1. Which four lines form the four sides of a rectangle? Explain your reasoning carefully. 2. Complete the drawing below to show the four lines and the x and y axes. Label the lines clearly. Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-2

4 Common issues: Does not link the properties of a rectangle with slopes of lines For example: The student does not mention in Q1 that a rectangle has two pairs of parallel sides and that these pairs are perpendicular, or connect this with the slope of the lines forming the sides. Demonstrates limited understanding of the link between the slope and the form of the equation of a straight line For example: The student identifies slopes for equations in which y is given explicitly in terms of x, y = mx + b, but not for other equations. Or: The student reads the number in front of x as if it were the slope in all equations. Provides insufficient reasoning For example: The student does not explain how looking for parallel and perpendicular lines relates to the task of finding the sides of the rectangle (Q1). Does not identify relevant information from the equations For example: The student fails to identify the x- and/or y-intercepts in Q2. Suggested questions and prompts: What do you know about the sides of rectangles? How is the property of being parallel [perpendicular] connected with slope? Why is looking for slopes of pairs of parallel and perpendicular lines relevant? How do you work out the slope of a line? How do you work out if two lines are parallel from their slopes? Perpendicular? Some equations are written with y isolated and others aren t. How does this affect how you calculate the slope? Why is looking for slopes of pairs of parallel and perpendicular lines relevant? How do you know that...? Explain your reasoning. What else can you figure out from the equations of the lines? Where does a pair of lines intersect? Where does a line intersect the x-axis? Where does a line intersect the y-axis? Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-3

5 SUGGESTED LESSON OUTLINE Interactive introduction (10 minutes) Give each student a mini-whiteboard, pen, and eraser. Today we re going to be looking at slopes and the equations of parallel and perpendicular lines. I am going to ask you a series of questions and I would like you to write your answers on your whiteboards. You may wish to draw a diagram if that helps. These introductory questions are designed to give you a greater insight into students misconceptions and are not intended to form a whole-class discussion. The questioning of students should be fast paced and should act as a means of stimulating students to think about the equations of parallel and perpendicular lines. Slides P-1 to P-9 can be used to present these questions if desired. What is the slope of the line joining the points (2,5) and (7,15)? [2.] Show me the coordinates of two points for which the slope of the line between them is 3. [E.g. (1,4) and (3,10).] Give me an equation of a line with a slope of 3. Keeping your equation on your whiteboard, write it in a different way. [E.g. [E.g. y = 3x +1.] y 3x = 1.] What is the y-intercept of the line What is the x-intercept of the line y = 3x + 7? [(0, 7).] 2y = 3x 6? [(2, 0).] Show me the equation of a line that is parallel to y = 2x + 4. [E.g. y = 2x 6.] What would be the slope of a line perpendicular to y = 2x + 4? [ ½.] Show me the equations of two lines that are perpendicular to each other. [E.g. y = 2x + 4 and y = 1 2 x + 4.] During this activity you will be able to identify common misconceptions within the group; this will help you to target groups of students effectively during the collaborative group work. Collaborative group work: matching task (30 minutes) Ask students to work in groups of two or three and give each group a copy of the Card Set: Equations (already cut up) and two copies of the Properties sheet. Introduce the activity: Find two Equations cards to match each of the Properties. You may want to spend some time thinking about the equations first. It might be helpful to figure out some extra information and write it on the cards. Once you have found two Equations cards that match a Property, explain to your partner(s) how you came to your decision. If your partner(s) agrees, they should explain your reasoning in their own words. If they disagree, they should explain why they think you are incorrect. In your group you need to be able to agree on and explain the placement of every card. Slide P-10 of the projector resource summarizes these instructions. Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-4

7 Whole-class discussion (20 minutes) Organize a whole-class discussion. First spend about five minutes considering categorizations and any discrepancies found amongst the groups. After you changed groups, did your new partners disagree with any of your answers? Give me an example of an equation or pair of equations on which you disagreed. What was the misconception? Can you explain your reasoning for the final categorization? Did any other group have different reasoning or categorize those equations under a different heading? Then spend about 15 minutes generalizing the mathematics students worked on during the lesson. Display Slide P-11 Lines and Rectangles. Tell students that the line segment SP has equation y = 2x + 3. In your groups I want you to decide on a possible equation for each of the line segments PQ, QR, and RS. Once you are all in agreement, write your equations on your whiteboards and show them to me. Give students a couple of minutes to come up with a possible solution. Then select an equation from each group and discuss whether or not it is a correct possible solution, focusing on why this is the case. Follow-up lesson: improve individual responses to the assessment task (15 minutes) Return students original assessment tasks, along with a second, blank copy of the task sheet. If you have not added questions to individual pieces of work, write your list of questions on the board. Students should select from this list only the questions they think are appropriate to their own work. Look at your original response and the questions (on the board/written on your script.) Answer these questions and using what you have learned, revise your work. If students are satisfied with their solutions, ask them to write down a general method for finding the equations of lines that form a rectangle. Some teachers give this as homework. Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-6

8 SOLUTIONS Assessment task: Parallel and Perpendicular Lines Question 1. Students may first put the equation into the form y = mx + b and look for m, the slope. y + 2x = 8 2y + 1 x +1 = 0 2 2y + x =1 y = 2(x 1) y = 2x + 8 y = 1 x y = 1 x + y = x y = 2x 2 Slope = 1 Slope = 2 Slope = 1 Slope = 1 Slope = y = x 4 y + 2x + 2 = 0 y = 1 x 2 y = 1 2 y = 2x 2 x + 2 y = 4 x 2y = 4 x 2 y = x + 4 y = 1 x Slope = 1 2 Slope = Slope = 2 Slope = 1 Slope = The slopes of parallel lines are equal. The product of the slope of a line and its perpendicular is -1. These pairs of lines are parallel: y + 2x = 8 and y + 2x + 2 = 0 2y = x 4 and y = 1 x y + x = 1 and 2y = 4 x Lines y + 2x = 8 and y + 2x + 2 = 0 are perpendicular to 2y = x 4 and y = 1 2 x + 2 so these form a rectangle. Question 2. Lines y + 2x = 8 and y + 2x + 2 = 0 have a negative slope, so they are the parallel pair shown on the diagram. Lines 2y = x 4 and y = 1 x have a positive slope so either 2y = x 4 or y = 1 2 x + 2 is the line that is missing. The y intercepts of lines 2y = x 4 and y + 2x + 2 = 0 are the same so these lines cross and intercept the y-axis at the point (0, -2). Line y = 1 2 x + 2 can be positioned by finding the line that is parallel to 2y = x 4 that passes through (0, 2) (y-intercept). Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-7

9 Collaborative work: Equations and Properties task These lines are parallel 2y = 8x + 3 y = 4x + 4 These lines have the same y- intercept y = 6x 4 2y + 8 = 3x These lines are perpendicular 4y = x + 3 y + 4x + 6 = 0 These lines have the same x-intercept 3y = 2x 8 2y + x = 4 These lines go through the point (1,5) y + 6x =11 y = 8x 3 Teacher guide Classifying Equations of Parallel and Perpendicular Lines T-8

10 Parallel and Perpendicular Lines Here are some equations of straight lines: y + 2x = 8 2y 1 2 x 1 0 2y + x =1 y x 4 y 2(x 1) 2y x 4 y 2x 2 0 y 1 2 x 2 y 4 x 2y 4 x 1. Which four lines form the four sides of a rectangle? Explain your reasoning carefully. 2. Complete the drawing below to show the four lines and the x- and y-axes. Label the lines clearly. Student materials Classifying Equations of Parallel and Perpendicular Lines S MARS, Shell Center, University of Nottingham

11 Card Set: Equations y = 4x + 4 4y x 3 y 8x 3 y 4x 6 0 3y 2x 8 y 6x 11 2y 8 3x 2y x 4 2y 8x 3 y 6x 4 Student materials Classifying Equations of Parallel and Perpendicular Lines S MARS, Shell Center, University of Nottingham

12 Properties These lines are parallel These lines are perpendicular These lines have the same y-intercept These lines have the same x-intercept These lines go through the point (1,5) Student materials Classifying Equations of Parallel and Perpendicular Lines S MARS, Shell Center, University of Nottingham

13 Question What is the slope of the line joining the points (2,5) and (7,15)? Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-1

14 Question Show me the coordinates of two points for which the slope of the line between them is 3. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-2

15 Question Give me an equation of a line with a slope of 3. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-3

16 Question Keeping your equation on your whiteboard, write it in a different way. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-4

17 Question What is the y-intercept of the line y = 3x + 7? Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-5

18 Question What is the x-intercept of the line 2y = 3x - 6? Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-6

19 Question Show me the equation of a line that is parallel to y = 2x + 4. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-7

20 Question What would be the slope of a line perpendicular to y = 2x + 4? Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-8

21 Question Show me the equations of two lines that are perpendicular to each other. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-9

22 Collaborative group work Find two Equations cards to match each Property. You may want to think about the equations first. You can write extra information on the cards. Once you have found two Equations cards that match a Property, explain to your partner(s) how you came to your decision. If your partner(s) agrees, they should explain your reasoning in their own words. If they disagree, they should explain why they think you are incorrect. In your group you need to be able to agree on and explain the placement of every card. Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-10

23 Lines and Rectangles Line segment SP has equation y = 2x + 3. P Find the equations of the line segments forming the other three sides of the rectangle. S Q R Projector Resources Classifying Equations of Parallel and Perpendicular Lines P-11

24 Mathematics Assessment Project CLASSROOM CHALLENGES This lesson was designed and developed by the Shell Center Team University of Nottingham, England Malcolm Swan, Clare Dawson, Sheila Evans, Colin Foster and Marie Joubert with Hugh Burkhardt, Rita Crust, Andy Noyes, and Daniel Pead It was refined on the basis of reports from teams of observers led by David Foster, Mary Bouck, and Diane Schaefer based on their observation of trials in US classrooms along with comments from teachers and other users. This project was conceived and directed for MARS: Mathematics Assessment Resource Service by Alan Schoenfeld, Hugh Burkhardt, Daniel Pead, and Malcolm Swan and based at the University of California, Berkeley We are grateful to the many teachers, in the UK and the US, who trialed earlier versions of these materials in their classrooms, to their students, and to Judith Mills, Mat Crosier, Anne Floyde, Michael Galan, Nick Orchard, and Alvaro Villanueva who contributed to the design. This development would not have been possible without the support of Bill & Melinda Gates Foundation We are particularly grateful to Carina Wong, Melissa Chabran, and Jamie McKee 2015 MARS, Shell Center, University of Nottingham This material may be reproduced and distributed, without modification, for non-commercial purposes, under the Creative Commons License detailed at All other rights reserved. Please contact if this license does not meet your needs.

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