Question

The square of y varies directly as the cube of x.When x=4 y=2.Which equation can be used to find other combinations of x and y

Answer 1

y² = (1/16)x³

Explanation:

Given that :

y² varies directly as the cube of x

y² α x³

y² = kx³ - - - (1)

Where, k = constant of f proportionality

We can obtain the value of k ; when x= 4 and y = 2

2² = k4³

4 = 64k

k = 4/64

k = 1/16

Putting k = 1/16 in (1)

y² = (1/16)x³