Question

If y varies directly as x and `x=15` when `y=3`, then how do you find y when `x=10`

Answer 1

`y=2`

Explanation:

`y prop x or y = k*x ; k` is variation constant.

`x=15 ; y=3 :. 3= k*15 or k =3/15 or k = 1/5 or k =0.2`

Thus the variation equation is `y=0.2*x`

When `x=10 ; :. y= 0.2*10 or y=2` [Ans]