# Overview. Observations. Activities. Chapter 3: Linear Functions Linear Functions: Slope-Intercept Form

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1 Name Date Linear Functions: Slope-Intercept Form Student Worksheet Overview The Overview introduces the topics covered in Observations and Activities. Scroll through the Overview using " (! to review, if necessary). Read each screen carefully. Look for new terms, definitions, and concepts. Observations The Observations illustrate mathematical concepts relating to writing slope in slope-intercept form. Scroll through the Observations using " (! to review, if necessary). Read each screen carefully. When you come to a Write an Observation screen, stop and write the answers to the questions on your worksheet. Observation Use your algebraic knowledge to change 3x + 4y = 8 to the form y = mx + b. Show your work. Remember: 3x + 4y = 8 is Standard Form. Activities The Activities section helps you practice using the slope-intercept form of lines. You can select from two activities Match It! or Line Soccer. Follow these steps to play the activity and complete your worksheet. 1. Make sure you are in the Activities for this section. 2. Highlight an activity using \$ or #, and press b Student Worksheet 2004 Texas Instruments Topics in Algebra 1

3 Name Date Activities (continued) Additional Problems 1. Make a table and draw the graph for the following linear functions. a. Y = MX + 2 b. Y = 2X N 1 X Y X Y 2. Think of the graph below as a map. You start to walk from the point (M1,1). You can walk only along a path that is the line with the slope: m = M2 a. Label two points, A and B, that you can walk to on the graph if the slope of your path =M2. Each tick mark is 1 unit. b. Find the equation of the line that describes your walking path. Show your work below. c. Record the coordinate points of A and B below. Use the equation of your path to check to see if your points A and B are on really on your line! Show your work below. Point Check It A= B= 3-30 Student Worksheet 2004 Texas Instruments Topics in Algebra 1

4 Name Date ³ Try-It!é on Your TI.83 Plus or TI.73 Parent and Family of Functions Compare graphs of Y1=X and Y2=X+1. If you know the graph of Y1=X, can you draw the graph of any line in slope-intercept form? Investigate using your graphing calculator! Note: See ³ TIpé 3: Graphing a Function and ³ TIpé 5: Adjusting the Viewing Window for instructions if you need help. Set up your graphing calculator so that GridOn on the window format (y.) screen and ZDecimal on the zoom menu (q) are selected. To Do This Press Display (TI.83 Plus shown) 1. Exit the Topics in Algebra 1 application and clear the Home screen. 2. Define Y1=X and Y2=X+1. Note: On the TI-73, use I rather than. y l áexitâ : o : # : \ 1 3. Set the viewing window. TI-83 Plus: ( 4:ZDecimal TI-73: ( 8:ZDecimal 4. Trace both Y1 and Y2. r or ~ to trace a function } and to move between functions 5. Write a description of what you see. How does the graph of Y=X compare to the graph of Y=X+1? Topics in Algebra Texas Instruments Student Worksheet 3-31

6 Linear Functions: Slope-Intercept Form Teacher Notes Objectives To review the form of the equation y = mx + b, where m is slope and b is the y-intercept. To view graphing lines and developing equations from data. To view tables of values and graphing lines from an equation of the form y = mx + b. To emphasize three ways of looking at lines, tables, graphs and equations. To develop the equation of a line from information given, such as slope and y-intercept, point and slope, and two points. To review the slope of parallel and perpendicular lines. Math Highlights This section highlights a review of the slope-intercept form of a line, y = mx + b. Students will review graphing a line using one point and the slope of the line. They will also see the equation of a line developed inductively from data by simulating the amount of volts produced by lining up batteries in series. Students will also review how to find a table and graph a line using the equation y = mx + b. A review of calculations follow, which show the step-by-step procedures needed to find the equation of a line given, the slope and y-intercept, the slope and a point on the line, and finally two points. Common Student Errors When students perform the calculations to find the equation of a line given the slope and y-intercept, the slope and a point on the line, or two points, they often have problems following the steps. For example, given two points, the student needs to perform three steps. First, the student needs to calculate the slope of the line. Students may forget the formula for slope, and then be careless about substituting the correct values in the formula. Also, they may make errors in sign. In the second step, they need to find b using the calculated slope and one of the points. Students need to understand that they could pick either point for this calculation. If the slope is incorrect from the first step, the error cascades into the rest of the solution. In the third step, they need to place all of the information into the final answer as y = mx + b. Students become comfortable using the variables x and y. They should be exposed to the use of other letters for the independent and dependent variables. Students should be able to recognize, for example, D = 2T + 4 as a linear relationship with independent variable T, dependent variable D, a slope of 2 and the D-intercept as 4. They need to learn that they will need to change the variables so the function reads y = 2x + 4 in order to graph it on the graphing calculator. Topics in Algebra Texas Instruments Teacher Notes 3-33

7 Student Worksheet Notes with Answers Overview Tell students: 1. How to find the Overview, or tell them to review the instructions on the worksheet. 2. How to navigate the application, if they are not yet familiar with the application. 3. To scroll through the Overview on the graphing calculator. Point out new terms, definitions, and concepts, and tell students to look for them as they go through the Overview. Observations The Observations help students understand using algebra to change a linear equation in standard form to slope-intercept form. If necessary, tell students how to find the Observations for this section. Observation Students use algebra to write 3x+4y=8 in y=mx+b form. Answers may vary, especially the step order. One possible answer: Step 1: Subtract 3x from both sides of the equation. 3x - 3x + 4y = 8-3x Step 2: Simplify the equation. 4y = M3x + 8 Step 3: Divide both sides of the equation by 4. 4y 4 = M3 4 x Step 4: Simplify to get the answer. y = M3 4 x Teacher Notes 2004 Texas Instruments Topics in Algebra 1

8 Activities Match It! Tell students to: 1. Select the correct answer to the question. Questions include: Scoring: Students get two attempts to answer the problem. They earn 2 points for a correct answer, 1 point for a correct answer on the second try. Selecting the graph that correctly illustrates an equation. Selecting the equation that correctly describes a graph. Selecting the equation that goes with the table. 2. Record their scores. Students can earn up to 12 points. Line Soccer Tell students to: Scoring: Students get two attempts to answer the problem. They earn 2 points for a correct answer, 1 point for a correct answer on the second try. Students score a goal when they answer a question correctly against Alex, the goalkeeper. They also get to keep any points they earned while passing the ball. Note: Unsimplified fractions are counted as correct. 1. Pass the ball by answering a question correctly. Possible slope-intercept questions include: Selecting the (x,y) coordinate that solves an equation. Using an (x,y) coordinate and b to solve for m in an equation. Using an (x,y) coordinate and m to solve for b. Using two (x,y) coordinates to calculate m and b. 2. Enter their answers in the following ways, as necessary: as a negative number, press Ì. as a mixed number, enter the whole number and press áunitâ, and then enter the fraction. as a fraction, press án/dâ and enter the numerator. Press án/dâ again and enter the denominator. 3. Show their work for each problem. 4. Record their scores. Topics in Algebra Texas Instruments Teacher Notes 3-35

9 Activities (continued) Additional Problems 1. Students make a table and draw the graph for Y=MX+2 and Y=2XN1. Answers may vary. Make sure that students correctly label the axes and all points from the corresponding table. 2. Students label two points, A and B, where the line segment between the two has a slope that is M2. a. Possible points students can walk to on the screen shown are (M2,3), (0,M1), and (1,M3). b. Students should use m=m2 and the point; for example, (M1,1) to find the y-intercept, b. The answer is y=m2xn1. c. Students should substitute their point in the line to see if the equation is satisfied. ³ Try-It!é on Your TI.83 Plus or TI.73 Students need to know the features of the graphing calculator covered in ³ TIpé 3: Graphing a Function and ³ TIpé 5: Adjusting the Viewing Window. They work through an investigation of parent and family of functions of Y=X. See Student Worksheet for details. Tell students to follow the steps exactly on the graphing calculators. Example screens are displayed on the worksheets for students to compare with the graphing calculator screens. This keystroke exercise lets students discover the connection between the parent and family of functions so they can quickly graph functions of the form y=mx+b. 5. Possible answers for comparing the graph of Y=X to Y=X+1: parallel, equivalent slope, offset by 1, Y=X crosses the origin (0,0), etc. 7. Possible answers for comparing the graph of Y=X to Y=XN1: same as above. 8. Students should draw the function on the worksheet first before graphing it on the graphing calculator. Y=X+2 intersects the X-axis at (M2,0) and the Y-axis at (0,2). 10. Students should draw the function on the worksheet first before graphing it on the graphing calculator. If they graph it without changing the window values, the screen looks like this: 3-36 Teacher Notes 2004 Texas Instruments Topics in Algebra 1

10 ³ Try-It!é on Your TI.83 Plus or TI.73 (continued) Parent and Family of Functions 11. Students cannot see all functions when they don t change their window values, which are: Xmin=M4.7, Xmax=4.7, Xmin=M3.1, Xmax=3.1. To fit all functions on the screen, Xmin>8 and Xmax>8. Functions in order from top to bottom: Y=X+8, Y=X+3, Y=XN3, Y=XN In order from top to bottom: Y=3X, Y=2X, Y=X (ZFit window values). Graph of Y=2X+3 (ZStandard window values). To graph the function Y=2X+3, students should think that the graph is parallel to Y=2X, and then shift Y=2X up 3 units on the Y-axis. Topics in Algebra Texas Instruments Teacher Notes 3-37

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