penyelesaian dari sistem...... x + y - z = - 3 x + 2y + z = 7 2x + 2y + z = 5

x + y - z = - 3
x + 2y + z = 7
__________ -
-y - 2z = -10

x + 2y + z = 7
2x + 2y + z = 5
___________ -
-x = 2
x = 2

x + y - z = - 3 | ×2 | 2x + 2y - 2z = -6
2x + 2y + z = 5 | ×1 | 2x + 2y + z = 5
___________________________ -
-3z = -11
z = 11/3

-y - 2(11/3) = -10
-y - 22/3 = -10
-y = -10 + 22/3
-y = -10 + 7 1/3
-y = 2 2/3
y = -2 2/3