2x - 3y = -17 dan 3x + 2y = -6 hasil dari x + y adalah

2x - 3y = -17 (dikali 2) 4x - 6y = -34
3x + 2y = -6 (dikali 3) 9x + 6y = -18
___________ +
13x = -52
x = -4
3x+2y = -6
3(-4) + 2y = -6
-12 + 2y = -6
2y = 12-6
2y = 6
y = 3

x+y = -4+3 = -1

2x - 3y = -17 (×2)  4x - 6y = -34
3x + 2y = -6  (×3)  9x + 6y = -18
___________________________ +
                         13x = -52
                             x = -4

2x - 3y = -17
2(-4) - 3y = -17
-8 - 3y = -17
-3y = -17 + 8
-3y = -9
y = 3

x + y
-4 + 3
-1