Question

If y varies directly as x and y = 144 when x = 12, what is the value of y when x = 17?

Answer 1

Direct variation:

`y=kx`

y=144 when x=12.

`144=12k \\ k=(144)/(12) \\ k=12`

y=? when x=17.

`y=12 * 17 \\ y=204`

y=204 when x=17.