Y varies directly with x if y=15 when x=-18 find y when x=1.6

The way I answered this question is by putting it in a equal equation. If y and x are directly related then you can solve it by doing the following:

y 15 = y

x 18 = 1.6

15 * 1.6 = 18*y

24 = 18y

18 18

1.333333333 = y

1.3 = y