To find x we would make x-y=15 into x=15+y so we can have an equation for x. We plug in for x in the other equation and we have -(15+y)+5y=13. We distribute the - sign to get -15-y+5y=13. We subtract a y from 5y and we have -15+4y=13. We add 15 to both sides to cancel out the negative 15. We get 4y=28. We divide by 4 to both sides to cancel out multiplying by 4. We get y as 7. Now, to get x we simply look back at the equation x-y=15. We plug 7 making x-7=15. Instead of subtracting we add 7 to both sides and we get x as 22. Therefore, x is 22 and y is 7
