x - y + 2z = -5 2x + y + z = -1 x + y + z = 3

x - y + 2z = -5
2x + y + z = -1
____________+
3x + 3z = -6

x - y + 2z = -5
x + y + z = 3
____________+
2x + 3z = -2

3x + 3z = -6
2x + 3z = -2
__________-
x = -4
disubtisusikan.
2x + 3z = -2
2(-4) +3z = -2
-8 + 3z =-2
3z=-2+8
z=2

x+y+z=3
-4 + y + 2 =3
y = 3 + 4 - 2
y= 5

jadi x=-4, z=2, y=5