Classwork. Exercises. hours, and 2 hours. Note that the units are in minutes and hours.
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1 Classwork Exercises 1. Peter paints a wall at a constant rate of 2 square feet per minute. Assume he paints an area, in square feet after minutes. a. Express this situation as a linear equation in two variables. b. Graph the linear equation. c. Using the graph or the equation, determine the total area he paints after 8 minutes, 1 hours, and 2 hours. Note that the units are in minutes and hours. Date: 4/5/14 S.128
2 2. The graph below represents Nathan s constant rate of walking. a. Nicole just finished a 5 mile walkathon. It took her 1.4 hours. Assume she walks at a constant rate. Let represent the distance Nicole walks in hours. Describe Nicole s walking at a constant rate as a linear equation in two variables. b. Who walks at a greater speed? Explain.. a. Susan can type 4 pages of text in 10 minutes. Assuming she types at a constant rate, write the linear equation that represents the situation. b. The table of values below represents the number of pages that Anne can type,, in minutes. Assume she types at a constant rate. Minutes Pages Typed Who types faster? Explain. Date: 4/5/14 S.129
3 4. a. Phil can build birdhouses in 5 days. Assuming he builds birdhouses at a constant rate, write the linear equation that represents the situation. b. The graph represents Karl s constant rate of building the same kind of birdhouses. Who builds birdhouses faster? Explain. 5. Explain your general strategy for comparing proportional relationships. Date: 4/5/14 S.10
4 Lesson Summary Problems involving constant rate can be expressed as linear equations in two variables. When given information about two proportional relationships, determine which is less or greater by comparing their slopes (rates of change). Problem Set 1. a. Train A can travel a distance of 500 miles in 8 hours. Assuming the train travels at a constant rate, write the linear equation that represents the situation. b. The graph represents the constant rate of travel for Train B. Which train is faster? Explain. 2. a. Natalie can paint 40 square feet in 9 minutes. Assuming she paints at a constant rate, write the linear equation that represents the situation. b. The table of values below represents Steven s constant rate of painting. Minutes Area Painted 10 Who paints faster? Explain Date: 4/5/14 S.11
5 . a. Bianca can run 5 miles in 41 minutes. Assuming she runs at a constant rate, write the linear equation that represents the situation. b. The graph below represents Cynthia s constant rate of running. Who runs faster? Explain. 4. a. Geoff can mow an entire lawn of 450 square feet in 0 minutes. Assuming he mows at a constant rate, write the linear equation that represents the situation. b. The graph represents Mark s constant rate of mowing a lawn. Who mows faster? Explain. Date: 4/5/14 S.12
6 5. a. Juan can walk to school, a distance of 0.75 miles in 8 minutes. Assuming he walks at a constant rate, write the linear equation that represents the situation. b. The graph below represents Lena s constant rate of walking. Who walks faster? Explain. Date: 4/5/14 S.1
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