Name
Class
2-2
Date
Standardized Test Prep
Direct Variation
Multiple Choice
For Exercises 1–5, choose the correct letter.
1. If y varies directly with x and y is 18 when x is 6, which of the following
represents this situation?
y 5 24x
y 5 3x
y 5 12x
y 5 13 x
2. Which function best represents the relationship between the quantities in the
table?
x 5 23 y 2 2
x
y
6
12
21
30
4
8
14
20
x 5 23 y 1 2
y 5 23 x
3
y 5 2x
3. If y varies directly with x and y is 9 when x is 5, what is x when y is 21?
21
5
1
29
5
9
4. Which equation of direct variation has (24, 28) as a solution?
y 5 13 x
y 5 23x
y 5 3x
5. Which equation does NOT represent a direct variation?
y
3
y 2 4x 5 0
y 2 4 5 14 x
x54
y 5 2 13 x
4y 5 2 14 x
Short Response
6. You can download a 5 MB file in 2 seconds. The time t it takes to download
a file varies directly with the size s of the file. Write an equation of direct
variation to represent the situation. How long will it take you to download
a 3 MB file?
Prentice Hall Algebra 2 • Teaching Resources
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