Question

Given y inversely proportional to x and x = 3 for y = 6, what is x if y = 9?

Answer 1

`x=2`

Explanation:

If `y` is inversely proportional to `x`, then `y=k/x` for some value `k`.

When `x=3`, `y=6`. So `6=k/3=>k=18`

`therefore y=18/x`

If `y=9`, `9=18/x=>x=2`