y varies directly with x . If y is 15 when x is 3, find y when x is 5.
A) y = 10
B) y = 20
C) y = 9
D) y = 40
E) y = 25

Name: y varies directly with x . If y is 15 when x is 3, find y when x is 5. A) y = 10 B) y = 20 C) y = 9 D) y = 40 E) y = 25
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Question

Quizplus · Accepted Answer

Since y varies directly with x, y = kx for some constant k. Given y = 15 when x = 3, we find k = 15/3 = 5. When x = 5, y = 5 * 5 = 25.

Y Varies Directly with X