Practice 5-4. Unit Rates and Slope. Name Class Date
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1 Name Class Date Practice 5-4 Unit Rates and Slope 5-4 Unit Rates and Slope 1. The graph shows the number of centimeters a particular plant grows over time. Given the points (0,0) and (4,6), how many centimeters does the plant grow per week? 2. The graph shows the relationship between time and the number of soda bottles a machine can make. Use the points (2,50) and (6,150) to find the number of soda bottles the machine can make each minute. 3. The points (15,21) and (25,35) form a proportional relationship. a) Find the slope of the line through the points. b) Which graph represents this relationship? 4. Your neighbor burns 117 Calories in 13 minutes cross-country skiing. There is a proportional relationship between Calories burned and time. a) Find the unit rate. Practice Homework G
2 b) Which graph represents the relationship between time and Calories burned? 5. The graph represents an object slowing to a stop. Find two points on the line and use them to find the slope of the line. 6. The graph shows the relationship between temperature and time for a scientific experiment where an object is heated. At what rate is the object heated? (4,36) (2,24) 7. Error Analysis A question on a test asks students to find the speed at which a car travels. The graph shows a proportional relationship between the distance traveled in miles and time in hours. Anna incorrectly says that the speed of the car is 1 mile per hour. 64 a) What is the speed of the car? Practice Homework G
3 b) What error might Anna have made? She used to find a unit rate, not. She used to find a unit rate, not. 8. Writing The graph shows a proportional relationship between the number of workers and weekly cost in dollars for a company. a) Use the points (7,5250) and (12,9000) to find the weekly cost for the company for each worker. b) Describe what a unit rate is used for. 9. Reasoning Assume that Car X and Car Y are both traveling at constant speeds. Car X has traveled 186 miles in 3 hours. Car Y has traveled 142 miles in 2 hours. a) Which graph represents the relationship between distance and time for Car X? b) Which graph represents the relationship between distance and time for Car Y? c) Explain your reasoning. Practice Homework G
4 10. Open-Ended The graph shows a relationship that is not proportional. a) Use the points (0,63) and (10,0) to find the slope. b) Describe a situation this graph could model. 11. Entertainment You need to hire a DJ for a party. The DJ charges an initial fee plus an hourly rate. The graph shows the relationship between cost and time. What is the DJ s hourly rate? 12. The graph shows the relationship between the number of minutes an airplane has been in the air and its elevation in feet. Use the points (2.5,4165) and (4,6664) to find the change in elevation of the airplane each minute. 13. The relationship between the number of gallons of water in a tank and number of hours is proportional. One point on the line modeling the relationship is (2,7200). a) Find the slope of the line. Practice Homework G
5 b) Which graph represents the relationship between time and the volume of water in the tank? c) Use the graph to find how long it will take to fill the tank if it holds 72,000 gallons. 14. Challenge The relationship between the number of parts a machine can manufacture and time is proportional. Suppose that the machine manufactures 24,900 parts in 3 hours. a) Find the unit rate. b) Which graph represents the relationship between time and the number of parts made? c) How long will it take the machine to make 199,200 parts? 15. Challenge These graphs show the relationship between growth and time for two different plants. a) Find the slope of the line for each graph. b) Compare the slopes. Practice Homework G
6 ANSWER KEY Practice 5-4: Unit Rates and Slope cm/wk a) 5 7 b) B 4. a) 9 cal/min b) C 5. The points (10, 0) and (7, 93) are on the line. The slope of the line is C/day 7. a) 64 mph b) B 8. a) $750 b) A unit rate compares a quantity to its unit of measure. Finding the cost of one unit makes it easy to find the cost of multiple units. A unit rate can be used to compare prices or calculate expenses. 9. a) C b) A c) Answers will vary 10. a) 6.3 b) Answers will vary 11. $ ,666 ft 13. a) 3,600 b) A c) 20 hr 14. a) 8,300 parts/hr b) B c) 24 hr 15. a) The slope of the line for Plant 1 is 2. The slope of the line for Plant 2 is 1. b) The slope of the line for Plant 1 is greater than the slope of the line for Plant 2. Practice Answer Key G
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