Question 141294
let x=Jack and y=Jill


"Jack is twice as old as Jill" __ x=2y


"In two years, Jack will be 4 times as old as Jill was 9 years ago" __ x+2=4(y-9)


substituting __ (2y)+2=4(y-9) __ 2y+2=4y-36 __ 38=2y __ 19=y


substituting __ x=2(19) __ x=38