Himpunan penyelesaian dari, SPLTV X-y+z=-2 X-y-z=0 adalah X+y+z=-6

a) x-y+z=-2
x-y-z=0
_________-
2z=-2
z=-1
b) x+y+z=-6
x-y-z=0
_________+
x=-6
c) x-y-z=0
-6-y-(-1)=0
-6-y+1=0
-y-5=0
-y=5
y= -5