Persamaan linear tiga veriabel X-y+2z=-5 2x+y+z=-1 X+y-z=3 Tolong dijawab segera

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

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

3x+3z=-6. dikali 1
2x+z=-2. dikali 3

3x+3z=-6
6x+3z=-6
-------------- -
-3x=0
x=0

2x+z=-2
2.0+z=-2
z=-2

x+y-z=3
0+y-(-2)=3
y=1

(0,1,-2)