Y varies directly as x

If x = 5 when y = 12 find x when y = 30

Set up a proportion so 12/5 = 30/x so cross multiply 5 times 30 is = to 12x now divide 150 (which is 30 times 5) by 12 and you get 12.5. So 12.5 is your answer

y 12 - x 5

y 30 - x?

x = 30 * 5 : 12

x = 12.5