Name:    Algebra 1 SOL A.18

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

The Friends of the Library Club is having a used paperback book sale. Koslo bought 5 books for \$2.50 while Cody bought 8 books for \$4.00. Which statement is true for Koslo and Cody?
 a. The cost of the books varies directly with the number of books purchased. b. The cost of the books varies inversely with the number of books purchased. c. The cost of the books varies directly with the square of the number of books purchased. d. The cost of the books varies inversely with the square of the number of books purchased.

2.

Which is the graph of a direct variation function?
 a. c. b. d.

3.

Which is a direct variation situation?
 a. When the price of t-shirts is lowered, the number sold increases. b. The time it takes to mow the grass decreases as the number of people working increases. c. The cost to fill a 10-gallon automobile gas tank increases as the cost per gallon of gas increases. d. The number of potatoes that will fit in a box decreases as the size of the potatoes increases.

4.

Which is the equation of the direct variation function that contains the ordered pairs in this table?

 x 2 6 10 y 1 3 5
 a. b. c. d.

5.

Anthony can iron 6 shirts in 1 hour. Which proportion could you use to find how many shirts x he can iron in 2.5 hours at this rate?
 a. c. b. d.

6.

Which is a direct variation function?
 a. c. b. d.

7.

The distance traveled in a given time on the Blue Ridge Parkway varies directly with the speed. Joe travels 120 miles at 30 miles per hour. How many miles would he travel in the same time period if he increased his speed to 40 miles per hour?
 a. 90 mi c. 135 mi b. 100 mi d. 160 mi

8.

In which table of ordered pairs does y vary directly as x?
 a. c. b. d.

9.

Jillian is reading a book about rabbits to her daughter Louise. If Jillian can read 6 pages in 10 minutes, how many minutes will it take her to read 21 pages at the same rate?
 a. 50 min c. 25 min b. 35 min d. 12.6 min

10.

If x varies directly as y and when , what is x when ?
 a. c. 16 b. 13.5 d. 24