Question

One number added to three times another number is 24. Five times the first number added to three times the other number is 36. Find the numbers

Answer 1

$x+3y=24\\ 5x+3y=36\\\\ x+3y=24\\ \underline{-5x-3y=-36}\\ -4x=-12\\ x=3\\\\ 3+3y=24\\ 3y=21\\ y=7$