Question

If y varies directly with x, and x = -6 when y = 2 and how do you find x when y = -9?

Answer 1

`x= 27`

Explanation:

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

`x=-6 ; y=2 :. 2= k* (-6) or k = 2/-6 or k = -1/3`

Thus,the variation equation becomes `y = -1/3 x or x=-3y`

When `y=-9 :. x =-3*y or x=-3* -9 =27`

`x= 27` [Ans]