Question

If y varies directly as x, and x=9 when y =15, find the value of y when x=33

Answer 1

y = 55

Explanation:

Direct variation is

y = kx where k is a constant

15 = k*9

15/9 =k

5/3 = k

The equation is y = 5/3 x

Let x = 33

y = 5/3 * 33

y = 55