# Calling Plans Lesson Part 1 Algebra

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1 Calling Plans Lesson Part 1 Algebra Overview: In this lesson students compare two linear relationships in the context of phone calling plans. Students are required to construct and interpret a table, a graph, and an equation for each calling plan to help them decide when one calling plan is a better deal than the other. This lesson is designed to focus on the standards for Quarter 1 while at the same time building the foundation for standards in subsequent quarters. The lesson could be extended so as to specifically address Standard 9.0 in Quarter 2. Student work for this problem should be kept so that it can be used in subsequent quarters when discussing the problem. The following notation is being used to differentiate between quarters: Quarter 1 Quarter 2 Goals: Students will solve the problem using an equation, a graph, and a table. Students will interpret a linear equation in terms of the problem. Students will justify their solutions to the problem. Students will construct and interpret the graph of a linear relationship in terms of the problem. Students will identify and interpret the x- and y-intercepts of the graph of a linear relationship in terms of the problem. Algebra Standards: 5.0 Students solve multi-step problems, including word problems, involving linear equations and linear inequalities in one variable and provide justification of each step. 6.0 Students graph a linear equation and compute the x- and y-intercepts. 7.0 Students verify that a point lies on a line, given the equation of the line. (Quarter1) Students are able to derive the equation of a line using the point-slope formula. (Quarter 2) 9.0 Students solve a system of two linear equations in two variables algebraically and are able to interpret the answer graphically The reasoning standards are in italics within the algebra standards. When mathematical reasoning is expected in the lesson, the text will be labeled Mathematical Reasoning within the text. Building on Prior Knowledge: Seventh grade Standards 3.0 Students graph and interpret linear and some nonlinear functions. 4.0 Students solve simple linear equations and inequalities over the rational numbers. Materials: Calling Plans task (attached); graph paper; calculators; rulers; chart paper; markers. Note: Developing an understanding of the mathematical concepts and skills embedded in a standard requires having multiple opportunities over time to engage in solving a range of different types of problems which utilize the concepts or skills in question.

3 SMALL GROUP RPOBLEM SOLVING Have students continue to work on the problem in their groups. Circulate among the groups assessing students understanding of the idea below. What do I do if students have difficulty getting started? Assist students/groups who are struggling to get started by prompting with questions such as: - What do you know about the phone plans? - What would be the cost for talking 1 minute in Company A s plan? 2 minutes? 5 minutes? - What would be the cost for talking 1 minute in Company B s plan? 2 minutes? 5 minutes? Can you find a way to determine the cost for any number of minutes? What misconceptions might students have? Look for and clarify any misconceptions students may have. a. incorrectly writing 4 cents as.4 rather than.04. How would you write 40 cents? OR Write down \$.40 and \$.04 and have students explain the difference between the two amounts. b. mixing dollars and cents notation. (e.g., 5 represents \$5 and 4 represents 4 cents. This would lead to an incorrect equation of C = 5 + 4m.) What does the 5 represent? What does the 4 represent? How would you write each in dollar notation? In cents notation? SMALL GROUP PROBLEM SOLVING What do I do if students have difficulty getting started? By asking a question such as What do you know about the phone plans? the teacher is providing students with a question that can be used over and over when problem solving. This will help them focus on what they know, what they were given, and what they need to determine. By beginning with one minute, students can begin to see what changes and what stays the same. In this case, that the fix fee (\$5 and \$2) stays the same and is added onto the charge for the number of minutes they used the phone. What misconceptions might students have? Misconceptions are common. Students may have remembered the information incorrectly or they may generalize ideas prematurely. Some strategies for helping students discover when they have made an error include: - Create comparison situations (e.g., \$.04 and \$.40) - Press students for the meaning of the numbers within the context of the problem. Consistently asking about the context helps students to make sense of the problem. c. misinterpreting the monthly fee and the per minute fee (e.g., You will see C =.04 + \$5m instead of C \$5 +.04m). If we are talking about the cost for one month then what does the \$5.00 and the \$.04 mean?

5 using an equation If students have not written an equation prompt them to do so by asking: - What do you know about the cost of using each plan? - How would you figure out the cost of Company A for 100 minutes? 200 minutes? Any number of minutes? - You said that the cost per minute is \$.04. How can you write this to show \$.04 per-minute no mater how many minutes we talk? - If we talk 1 minute at.04, 2 minutes at.04, 5 minutes at.04, or a hundred minutes at.04? If you add on the base/initial fee, then how would you write this in the number sentence? Work with groups of students so equations appear on charts for the group discussion. using an equation Students should be able to state that the cost per minute must be multiplied by the number of minutes and that the monthly fee must be added on. Asking students to describe the plan, then formalizing their verbal description of the plans will help students make connections between their informal problem-solving strategies and formal symbolic equations. If students are having difficulty writing an equation refer to the information in the table. As students point to the cost for the plan, ask them how they arrived at the cost. When they tell you that they multiplied by the number of minutes by.04 then tell them to write this down. Ask the student what amount this gives them. The student will notice that the base not been included. Ask them how you will add it on.

6 using a graph - Independent and Dependent Variable To assess student understanding of the dependent and independent variable ask: - What goes on the x-axis and what goes on the y-axis? Why? - Does the time you talked on the phone depend on the cost or does the cost of the plan depends on how long you talked? - Scale of the Graph - What units are we dealing with for each axis? - Tell students: The scale for the x- and y-axis does not have to increase by the same increment, but each axis must increase by a fixed increment. using a graph - Independent and Dependent Variable Students should label the x-axis as their time or minutes axis and the y-axis as their cost axis. Mathematical Reasoning: Students should explain that the cost depends on the number of minutes used. - Scale of the Graph Students should identify x axis as minutes and y axis as cost Look for students who do not use fixed increments (e.g. some will start with 1 min., 2 min., and then jump to 10 min. and 20 min.) Students may believe they must use the same scale for both axes. If they attempt to use the same scale, the x (minutes) axis must go beyond 50 while the y (cost) axis only needs to go past 7. Therefore, it will be difficult to physically construct the graph. - The Point of Intersection and the Solution to the Problem Ask students to indicate where the solution to the problem is on the graph. If they indicate that it is the point of intersection, ask: What does the point of intersection mean in this problem? - The Point of Intersection and the Solution to the Problem Mathematical Reasoning: Students should state that the point of intersection is the point where both plans cost the same for the same number of minutes. It is important to hear students talk about both the cost and minutes. They also need to state that the point of intersection is not the solution. Rather, the solution is that after that point, Plan A is cheaper than Plan B beyond the point of intersection. They should be able to explain, using the graph, that after the lines intersect the graph of Plan A is below the graph of Plan B.

7 S H A R E, D I S C U S S, A N D A N A L Y Z E GROUP DISCUSSION In what order will I have students post solution paths so I will be able to help students make connections between the solution paths? As you circulate among the groups, look for solutions that will be shared with the whole group and consider the order in which they will be shared. Ask students to explain their solutions to you as you walk around. Make certain they can make sense of the different parts of the table in terms of the problem and the different parts of the graph in terms of the problem. Ask students to post their work in the front of the classroom. The goal is to discuss mathematical ideas associated with cost-per-minute (rate of change/slope) and monthly fee (y-intercept) for each plan. Students should be able to say why one plan starts out as the less expensive plan but over time it is the most expensive plan. They should understand how this information is represented in a table, a graph and an equation. GROUP DISCUSSION In what order will I have students post solution paths so I will be able to help students make connections between the solution paths? Even though you may display the work produced by all groups, you should strategically pick specific examples to discuss with the whole group. You might want to choose solutions in which tables show different time increments as well as making certain you choose a solution that shows the correct graph. It would also be helpful to have a solution with a correct equation so that connections can be made among the 3 strategies. Analyzing incorrect solutions can also be a way of helping students develop the ability to detect and correct errors and to explain their thinking about what does and does not work and why. Students might say that one plan starts out more because one plan has a base fee of \$5.00 and the other has a base fee of \$2.00. Over time, the plan with a \$5.00 base fee becomes less expensive because the cost-perminute for this plan is less than the cost-per-minute of the other plan. Students should make a comparison between the base fees and the costper-minute of each plan when justifying their response.

9 Referring to an equation Company A Company B C =.04m C =.10m + \$2.00 Referring to a graph Calling Plans Costs cost in dollars minutes Cost (A) Cost (B) Cost Per Minute - Why did some of us think that Plan A became the better deal at 60 minutes and others think it was 55 minutes? - How do we see the cost-per-minute for each plan in the table? Where is the \$.04 in the table? Where is the \$.10 in the table? - Follow the same line of questions for Company B. - How would you write an equation that will help you figure out the cost for 32 minutes if you use Company A? Company B? Why did you multiply 32 x.04? Why do we add \$5.00 or \$2.00? Once students have written an equation, give students a minute to solve for the cost of 32 minutes in each plan. Have students verify that these points (32, 6.28) and (32, 5.20) are in fact points on the lines by approximating where they would be using the graph. Driving Question * How can Plan A end up being the better plan when it starts out costing the most and Plan B starts out costing the least? Cost Per Minute It is worth discussing the fact that the cost per minute is within each table but hidden when using increments greater than 1 minute. If students are struggling with this concept, choose 2 consecutive entries for Company A (15 minutes -\$5.60 and 20 minutes - \$5.80) and ask students to talk about the cost per minute. In this case, students should see that 5 minutes cost an additional \$.20 and that this is the same as \$.04 for one minute. Do the same for Company B. Mathematical Reasoning: The coefficient - When you ask students why they multiplied 100 (.04) or 100 (.10) they should say that every minute that you talk on the phone you are charged.04 or.10 minutes so if you talk 100 minutes this is 100 times the.04 or.10. The constant - Students should explain that the initial fee is added on because it is a one-time fee, not a per-minute fee.

10 y-intercept or Monthly Fee - Point to 0 minutes in the table and ask: What does this mean in terms of the phone plans? - Point to the graph and ask: One plan begins at \$5.00 and the other at \$2.00. What does that mean with respect to each plan? - Is the monthly fee shown in the equations? Why did they add the fee on? - Mark this information by saying: We call the \$5.00 and \$2.00 the y- intercepts because this is where the number of minutes (the x value) is equal to zero and where the lines touch or cross the y-axis. - Will these lines ever cross the x-axis? Driving Question * Plan A has an initial fee that is greater than Plan Bs initial fee, so how can Plan A end up saving you money? Slope/Rate of Change Prompt a discussion with the following question: - What makes Company A end up being a better deal than Company B? - Emphasize the way the plans are growing by saying: The rate of growth for each plan is \$.04 and \$.10 per minute. What does this have to do with the steepness of lines? - Press students further by asking: Plan A charges more for the base fee and less per minute. Help me understand how we end up making up for the difference between the two plans initial fee? - Invite students to use a yardstick and show the graph for each of the lines represented by the equations below: C = \$ x C = \$ x C = \$ x y-intercept or Monthly Fee Students should state that the y-intercepts are the costs of the plans for talking 0 minutes. They may call the amount the base fee or the service charge. Mathematical Reasoning (x-axis): When asked if the graphs will ever cross the x-axis, students should say that the line will cross the x-axis when x is negative. But that, in this context, you can t have negative minutes so we stop at x = 0. Show the line extending on the graph so students can explain the reason why the line must be limited to the positive values for x (minutes) and y (cost). Using an equation Company A Company B C =.04(0) + 5 C =.10(0) + 2 C = C = C = 5 C = 2 Company A charges \$5 for 0 minutes and Company B charges \$2 for 0 minutes. Slope/Rate of Change Mathematical Reasoning (Slope): Students will say Plan B goes up by.10 and Plan A goes up by.04. Refer to the going up at the same rate as the rate of change. Talk about the slope as the rate of change per minute. For each additional minute talked the plan rises or increases by \$.04 or \$.10 minutes. The relationship between the minutes and the cost should be explicit. Mathematical Reasoning: Students should say that Company B makes up the cost charged initially by Company A after 50 minutes. Since perminute-cost is greater for Company A than it is for Company B, it will take 50 minutes for Company B to recover the \$3.00 difference between the two companies initial fees. Every minute used on Company B s plan earns \$.06 more than Company A s plan. After 50 minutes the \$3.00 difference between the two companies initial fees will be recovered. Mathematical Reasoning (Extension Expressions): Students should be able to say that \$ \$.04 is parallel to Company A s plan because the per-minute-cost is the same. (It has the same steepness as Plan A.) Students should explain that \$ x and \$ x will be steeper lines than Company A s line.

11 HOMEWORK You could give the following problems as a homework assignment: Company C has no monthly fee but charges 12 cents a minute. Using a table, a graph, and an equation, determine when Company A would be cheaper than Company C. OR Create phone plans that would be cheaper than company A if: a. you didn t use the phone very often. b. you used the phone all of the time.

12 Calling Plans Long-distance Company A charges a base rate of \$5 per month, plus 4 cents per minute that you are on the phone. Long-distance Company B charges a base rate of only \$2 per month, but they charge you 10 cents per minute used. How much time per month would you have to talk on the phone before subscribing to Company A would save you money? (Achieve, Inc., 2002)

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