if y varies directly as x and y=12 when x=3 find y when x=7

Question

this Is for my math class pls help

Answer 1

y = kx    Replace y with 12 and x with 3.

12 = 3k   Divide both sides by 3.

4 = k 

 

y = 7(4)  Replace x with 7 and k with 4.

y = 28