Question

The variable y varies directly with x. The value of y is 24 when x=8.

Find the value of y when x=5

Answer 1

y=15

Explanation:

you do 24/8=3 and that lets you know that y is 3 times the x value. (8 x 3=24). So then just multiply 5 by 3 to get 15.

Answer 2

Explanation:

y = kx, where k is a real constant.

When x = 8, y = 24.

=> (24) = k(8), k = 3

Therefore when x = 5,

y = kx = (3)(5) = 15.