NAME DATE PERIOD Lesson 5 Extra Practice

NAME _____________________________________________ DATE ____________________________ PERIOD ____________

Lesson 5 Extra Practice

Direct Variation

For Exercises 1?2, determine whether each linear function is a direct variation. If so, determine the constant of variation. If not, explain why not.

1.

Hours, x Distance, y(miles)

11 $0.41

12 $0.82

13 $1.23

14 $1.64

2.

Hours, x

5

8

11

14

Earnings, y 40

64

88 112

For Exercises 3?5, y varies directly with x. Write an equation for the direct variation. Then determine each value. 3. If y = 16 when x = 4, determine y when x = 9.

4. If y = ?5 when x = 2, determine y when x = 8.

5. If y = ?7 when x = ?21, determine x when y = 9.

6. Bruce rents snowmobiles to tourists. He charges $135 for 4 hours and $202.50 for 6 hours? What is the hourly rate Bruce charges to rent a snowmobile?

7. The power absorbed by a solar panel varies directly with its area. If an 8 square meter panel absorbs 8,160 watts of power, how much power does a 12 square meter solar panel absorb?

8. The amount Ramar saves y varies directly with the number of weeks he saves x as shown in the graph. Write a direct variation equation. Identify the constant of variation and interpret its meaning.

Course 3 ? Chapter 3 Proportional Relationships and Slope

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