For this case we have the following system of equations: x = -5 + y 28x + 11y = 16 Solving for y we have: 28 (-5 + y) + 11y = 16 -140 + 28y + 11y = 16 39y = 16 + 140 y = 156/39 y = 4 Solving for x we have: x = -5 + 4 x = -1 Answer: The solution is: (x, y) = (- 1, 4)