Tentukan x y dan z dari persamaan X-y+2z=-5 2x+y+z=-1 X+y-z=-3

X-y+2z=-5 |×2| 2x - 2y+ 4z = - 10
2x+y+z=-1 |×1 | 2x + y + z = - 1
- 1 y + 3 z = - 9

2x+y+z = - 1 | ×1 | 2x+y+z=-1
X +y-z = - 3 |×2 | 2x+2y-2z =-6
- 1y+3z=-6

-1y+3z =-9
-1y+3z =-6
Y= - 3

3-3z=-9
3z=-9-3
3z=-12
Z=-4

X+y-z = - 3
X-3+4=-3
X+1=-3
X=-3-1
X = - 4

X=-4
Y=-3
Z=-4