Question

Y is directly proportional to x 2 . If y = 112 when x = 4 find y when x = 9

Answer 1

y = 567

Explanation:

y = x^2

y = kx^2 ........k is constant

112 = k * 4^2

k = 112/ 4^2

k = 7

so,

y = x^2

if x = 9

then,

y = 7 * 9^2

y = 567