Question

The value of y varies directly with x^2, and y = 64 when x = 4. what is the value of y when x = 6?

Answer 1

y α x²

y = kx²

64 = k*4²

64 = k*4*4

64 = 16k

64/16 = k

4 = k

k = 4


y = kx²

y = 4*6²

y = 4*6*6

y = 144