Question

Y varies directly with the cube of x
y = 108 when x = 3

Express y In terms of x

Answer 1

y = 36x

Explanation:

y varies directly with x ,

that is y
`\propto` x

Let k be constant

=> y = kx

=> 108 = k(3)

=> k = 108/3

=> k = 36

y can be expressed in terms of x as kx or simply 36x . As we found value of constant as 36.