Question

If y varies directly as x and y=12 when x=72, find x when y=9

Answer 1

9 x 72 = 648

648 ÷ 12 = 54

x = 54

Hope this helps :)

Answer 2

You can do 12/72 = 9/x. You cross multiply and it becomes 12x = 648. Divide 648 by 12, and x equals 54.