Question

Y is proportional to x. When x = 5, then y = 20, find the value of x when y = 28 A. 5 B. 6 C. 7 D. 8

Answer 1

C. 7

Explanation:

If y is proportional to x, we can express their relationship as y=kx.

Plugging in the values: 20=5k

Divide by 5 on both sides: k=4

Plug in 28 for y: 28=4x

Divide by 4 on both sides: x=7

So the answer is C. 7