Lesson 11: Classwork. Example 1 S.41
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1 Classwork Example 1 Pauline mows a lawn at a constant rate. Suppose she mows a 35-square-foot lawn in 2.5 minutes. What area, in square feet, can she mow in 1 minutes? tt minutes? tt (time in minutes) Linear Equation: yy (area in square feet) S.41
2 Example 2 Water flows at a constant rate out of a faucet. Suppose the volume of water that comes out in three minutes is 1.5 gallons. How many gallons of water come out of the faucet in tt minutes? tt (time in minutes) Linear Equation: VV (in gallons) S.42
3 Exercises 1. Juan types at a constant rate. He can type a full page of text in 3 1 minutes. We want to know how many pages, pp, 2 Juan can type after tt minutes. a. Write the linear equation in two variables that represents the number of pages Juan types in any given time interval. b. Complete the table below. Use a calculator, and round your answers to the tenths place. tt (time in minutes) Linear Equation: pp (pages typed) S.43
4 d. About how long would it take Juan to type a 5-page paper? Explain. 2. Emily paints at a constant rate. She can paint 32 square feet in 5 minutes. What area, AA, in square feet, can she paint in tt minutes? a. Write the linear equation in two variables that represents the number of square feet Emily can paint in any given time interval. b. Complete the table below. Use a calculator, and round answers to the tenths place. tt (time in minutes) Linear Equation: AA (area painted in square feet) S.44
5 d. About how many square feet can Emily paint in 2 1 minutes? Explain Joseph walks at a constant speed. He walked to a store that is one-half mile away in 6 minutes. How many miles, mm, can he walk in tt minutes? a. Write the linear equation in two variables that represents the number of miles Joseph can walk in any given time interval, tt. S.45
6 b. Complete the table below. Use a calculator, and round answers to the tenths place. tt (time in minutes) Linear Equation: mm (distance in miles) d. Joseph s friend lives 4 miles away from him. About how long would it take Joseph to walk to his friend s house? Explain. S.46
7 Lesson Summary When constant rate is stated for a given problem, then you can express the situation as a two-variable equation. The equation can be used to complete a table of values that can then be graphed on a coordinate plane. Problem Set 1. A train travels at a constant rate of 45 miles per hour. a. What is the distance, dd, in miles, that the train travels in tt hours? b. How many miles will it travel in 2.5 hours? 2. Water is leaking from a faucet at a constant rate of 1 gallon per minute. 3 a. What is the amount of water, ww, in gallons per minute, that is leaked from the faucet after tt minutes? b. How much water is leaked after an hour? 3. A car can be assembled on an assembly line in 6 hours. Assume that the cars are assembled at a constant rate. a. How many cars, yy, can be assembled in tt hours? b. How many cars can be assembled in a week? 4. A copy machine makes copies at a constant rate. The machine can make 8 copies in minutes. a. Write an equation to represent the number of copies, nn, that can be made over any time interval in minutes, tt. b. Complete the table below. tt (time in minutes) Linear Equation: nn (number of copies) S.47
8 d. The copy machine runs for 2 seconds and then jams. About how many copies were made before the jam occurred? Explain. S.48
9 5. Connor runs at a constant rate. It takes him 34 minutes to run 4 miles. a. Write the linear equation in two variables that represents the number of miles Connor can run in any given time interval in minutes, tt. b. Complete the table below. Use a calculator, and round answers to the tenths place. tt (time in minutes) Linear Equation: mm (distance in miles) d. Connor ran for 4 minutes before tripping and spraining his ankle. About how many miles did he run before he had to stop? Explain. S.49
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