Question

If y varies directly as the square of x and y =72 when x = 3, find y when x= 5

Answer 1

y =200

Explanation:

Y varies directly with square of x is given by y = kx ²

72 = k (3)² = 9k

k = 72/9 = 8.

y = kx²

y = (8)(5)²

y = 200