If y is directly proportional to x , and y = 225 when x = 200, find the value of y when x = 64.
A) y = 82
B) y = 69
C) y = 74
D) y = 72
E) y = 67

Name: If y is directly proportional to x , and y = 225 when x = 200, find the value of y when x = 64. A) y = 82 B) y = 69 C) y = 74 D) y = 72 E) y = 67
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Question

Quizplus · Accepted Answer

Since y is directly proportional to x, we have y = kx for some constant k. Given y = 225 when x = 200, we find k = 225/200 = 1.125. For x = 64, y = 1.125 * 64 = 72.

If Y Is Directly Proportional to X , and Y