Question

X varies inversely as the square of y, and x=3 when y=20, what is the equation?

Answer 1

The equation is `x * y^2= 1200`

Explanation:

`x prop 1/y^2 or x = k * 1/y^2 or x * y^2 = k ; k` is constant of

proportionality. `x =3 , y = 20 ;` then , `3* 20^2 = k or k =1200`

`:. x * y^2 = 1200`

Hence the equation is `x * y^2= 1200` [Ans]