Question

If y varies inversely with x. how do you find the inverse variation equation if x = -3 when y = 30?

Answer 1

`xy=-90`

Explanation:

If `y` varies inversely as `x` then
`color(white)("XXX")x*y=k` for some constant `k`

Since `x=-3` when `y=30`
`color(white)("XXX")(-3)*(30)=k`

`color(white)("XXX")rarr k=-90`