# Lesson 8: Representing Proportional Relationships with Equations

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1 Lesson 8: Representing Proportional Relationships with Equations Student Outcomes Students use the constant of proportionality to represent proportional relationships by equations in real world contexts as they relate the equations to a corresponding ratio table and/or graphical representation. Classwork Discussion (5 minutes) Points to remember: Proportional relationships have a constant ratio, or unit rate. The constant ratio, or unit rate, can also be called the constant of proportionality. Discussion Notes How could we use what we know about the constant of proportionality to write an equation? Discuss important facts. Encourage students to begin to think about how we can model a proportional relationship by using an equation by framing with the following probing questions: If we know that the constant of proportionality,, to be equal to for a given set of ordered pairs, and, then we can write. How else could we write this equation? What if we know the -values, and the constant of proportionality, but do not know the -values. Could we rewrite this equation to solve for? Elicit ideas from students. Apply ideas in examples below. Provide the context of the examples below to encourage students to test their thinking. Students should note the following in their materials: and eventually (may need to add this second equation after Example 1). Date: 4/7/14 66

2 Examples 1 and 2 (33 minutes) MP. 2 Write an equation that will model the real world situation. Example 1: Do We have Enough Gas to Make it to the Gas Station? Your mother has accelerated onto the interstate beginning a long road trip and you notice that the low fuel light is on, indicating that there is a half a gallon left in the gas tank. The nearest gas station is 26 miles away. Your mother keeps a log where she records the mileage and the number of gallons purchased each time she fills up the tank. Use the information in the table below to determine whether you will make it to the gas station before the gas runs out. You know that if you can determine the amount of gas that her car consumes in a particular number of miles, then you can determine whether or not you can make it to the next gas station. Mother s Gas Record Gallons Miles Driven a. Find the constant of proportionality and explain what it represents in this situation. Gallons Miles Driven Constant of proportionality is. The car travels 28 miles for every one gallon of gas. b. Write equation(s) that will relate the miles driven to the number of gallons of gas. or c. Knowing that there is a half gallon left in the gas tank when the light comes on, will she make it to the nearest gas station? Explain why or why not. No, she will not make it because she gets 28 miles to one gallon. Since she has ½ gallon remaining in the gas tank, she can travel 14 miles. Since the nearest gas station is 26 miles away, she will not have enough gas. d. Using the equation found in part b, determine how far your mother can travel on 18 gallons of gas. Solve the problem in two ways. Using arithmetic: Using Algebra: Use substitution to replace the g (gallons of gas) with 18. This is the same as multiplying by the constant of proportionality. Your mother can travel 504 miles on 18 gallons of gas. Date: 4/7/14 67

3 e. Using the equation found in part b, determine how many gallons of gas would be needed to travel 750 miles. Using arithmetic: Using algebra: Use substitution to replace the m (miles driven) with 750. This equation demonstrates the same as dividing by the Constant of Proportionality or algebraically, use the multiplicative inverse (making one) to solve the equation (rounded to the nearest tenth) gallons would be needed to drive 750 miles. Have students write the pairs of numbers in the chart as ordered pairs. Explain that in this example = gallons and = miles driven. Remind students to think of the constant of proportionality as. The ratio is a certain number of miles divided by a certain number of gallons. This constant is the same as the unit rate of miles per gallon. Remind students that you will use the constant of proportionality (or unit rate) as a multiplier in your equation. Write equation(s) that will relate the miles driven to the number of gallons of gas. In order to write the equation to represent this situation, direct students to think of the independent and dependent variables that are implied in this problem. Which part depends on the other for its outcome? The number of miles driven depends on the number of gallons of gas that are in the gas tank. Which is the dependent variable gallons of gas or miles driven? The number of miles is the dependent variable while the number of gallons is the independent variable. Tell students that is usually known as the independent variable, and is known as the dependent variable. Remind students the constant of proportionality can also be expressed as from an ordered pair. It is the ratio of the dependent variable to the independent variable. Ask, when and are graphed on a coordinate grid, which axis would show the values of the dependent variable? -axis The independent variable? - axis Tell students that any variable may be used to represent the situation as long as it is known that in showing a proportional relationship in an equation that the constant of proportionality is multiplied by the independent variable. In this problem, students can write or. We are substituting the 28 for in the equation or. Tell students that this equation models the situation and will provide us with a way to determine either variable when the other is known. If the equation is written so that the known information is substituted into the equation, then students can use algebra to solve the equation. Date: 4/7/14 68

4 Example 2: Andrea s Portraits Andrea is a street artist in New Orleans. She draws caricatures (cartoon-like portraits of tourists). People have their portrait drawn and then come back later to pick it up from her. The graph below shows the relationship between the number of portraits she draws and the amount of time in hours needed to draw the portraits. a. Write several ordered pairs from the graph and explain what each coordinate pair means in the context of this graph. (4, 6) means that in 4 hours she can draw 6 portraits (6, 9) means that in 6 hours she can draw 9 portraits (2, 3) means that in 2 hours she can draw 3 portraits (1, 1 ½) means that in 1 hour she can draw 1 ½ portraits b. Write several equations that would relate the number of portraits drawn to the time spent drawing the portraits. c. Determine the constant of proportionality and explain what it means in this situation. The constant of proportionality is which means that Andrea can draw portraits in hours or can complete portrait in 1 hour. Tell students these ordered pairs can be used to generate the constant of proportionality and write the equation for this situation. Remember that. Closing (2 minutes) How can unit rate be used to write an equation relating two variables that are proportional? The unit rate is the constant of proportionality,. After computing the value for, it may be substituted in place of in the equation. The constant of proportionality can be multiplied by the independent variable to find the dependent variable, and the dependent variable can be divided by the constant of proportionality to find the dependent variables. Lesson Summary: If a proportional relationship is described by the set of ordered pairs that satisfies the equation, where is a positive constant, then is called the constant of proportionality. The constant of proportionality expresses the multiplicative relationship between each -value and its corresponding -value. Exit Ticket (5 minutes) Date: 4/7/14 69

5 Name Date Lesson 8: Representing Proportional Relationships with Equations Exit Ticket John and Amber work at an ice cream shop. The hours worked and wages earned are given for each person. John s wages Time (h) Wages (\$) a. Determine whether John s wages are proportional to time. If they are, determine the unit rate. If not, explain why not. b. Determine whether Amber s wages are proportional to time. If they are, determine the unit rate. If not, explain why not. Date: 4/7/14 70

6 c. Write an equation to model the relationship between each person s wages. Identify constant of proportionality for each. Explain what it means in the context of the situation. d. How much would each worker make after working 10 hours? Who will earn more money? e. How long will it take each worker to earn \$50? Date: 4/7/14 71

7 Exit Ticket Sample Solutions The following solutions indicate an understanding of the objectives of this lesson: John and Amber work at an ice cream shop. The hours worked and wages earned are given for each person. John s wages Time (h) Wages (\$) /2 = /3 = /4 = 9 a. Determine whether John s wages are proportional to time. If they are, determine the unit rate. If not, explain why not. Yes, the unit rate is 9. The collection of ratios is equivalent. b. Determine whether Amber s wages are proportional to time. If they are, determine the unit rate. If not, explain why not. Yes, the unit rate is 8. The collection of ratios is equivalent. c. Write an equation to model the relationship between each person s wages. Identify constant of proportionality for each. Explain what it means in the context of the situation. John: ; constant of proportionality is ; John earns for every hour he works. Amber: ; constant of proportionality is ; Amber earns for every hour she works. d. How much would each worker make after working 10 hours? Who will earn more money? After hours John will earn \$90 because 10 hours is the value of the independent variable which should be multiplied by the constant of proportionality. ; ;. After hours Amber will earn because her equation is ; ;. John will earn more money than Amber in the same amount of time. e. How long will it take each worker to earn \$50? To determine how long it will take John to earn, the dependent value will be divided by 9, the constant of proportionality. Algebraically, this can be shown as a one-step equation: ; ; ; (round to the nearest hundredth). It will take John nearly hours to earn. To find out how long it will take Amber to earn divide by, her constant of proportionality. ; ; ;. It will take Amber hours to earn. Date: 4/7/14 72

8 Problem Set Sample Solutions Write an equation that will model the proportional relationship given in each real world situation. 1. There are 3 cans that store 9 tennis balls. Consider the number of balls per can. a. Find the constant of proportionality for this situation. b. Write an equation to represent the relationship. 2. In 25 minutes Li can run 10 laps around the track. Consider the number of laps she can run per minute. a. Find the constant of proportionality in this situation. b. Write an equation to represent the relationship. 3. Jennifer is shopping with her mother. They pay \$2 per pound for tomatoes at the vegetable stand. a. Find the constant of proportionality in this situation. b. Write an equation to represent the relationship. 4. It cost \$5 to send 6 packages through a certain shipping company. Consider the number of packages per dollar. a. Find the constant of proportionality for this situation. b. Write an equation to represent the relationship. Date: 4/7/14 73

10 a. Does either pricing model represent a proportional relationship between quantity of t-shirts and total cost? Explain. The unit rate for Print-o-Rama is not constant. The graph for Value T s and More is proportional since the ratios are equivalent (8) and the graph shows a straight line through the origin. b. Write an equation relating cost and shirts for Value T s and More. for Value T s and More c. What is the constant of proportionality of Value T s and More? What does it represent? 8; the cost of one shirt is \$8. d. How much is Print-o-Rama s set up fee? Guess and Check: C= price of a shirt (# of shirts) + set up fee 95 = 10 + or 375 = 50 + Attempt #1 Attempt #2 Set up fee = \$25 e. Write a proposal to your teacher indicating which company the team should use. Be sure to support your choice. Determine the number of shirts that you need for your team. Since we plan on a purchase of 90 shirts, we should choose Print-o-Rama. Print-o-Rama: ; ; Value T s and More: ; ; Date: 4/7/14 75

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