x + y = 24
x - 6 = 3 (y - 6) ... x = 3 y - 12
substituting ... 3 y - 12 + y = 24
solve for y , then substitute back to find x
Sarah and Louise have a combined age of 24. Six years ago Sarah was three times
as old as Louise. Let Sarah be x years and Louise y years.
1 answer