Question

If y varies directly with x, if y=4 when x=16, how do you find y when x=6?

Answer 1

A direct variation is always of the form `y=mx`

Explanation:

The pair `(16,4)` gives us the constant `m` to be `1/4`,
because `4=1/4 xx16`

Now for any value of `x`, the value of `y=1/4x`

`x=6->y=1/4xx6=6/4=1 1/2`