x+y+z =-3 x-y =7 2x + 2y -z =6

X+y+z =-3
X-y = 7
2x+2y-z = 6

X+y+z = -3 I X2 I =
2x+2y-z =6 I x1 I =

2x+2y+2z = -6
2x+2y-z. = 12
--------------------- (-)
3z = -18
Z = -18/3
Z = -6

X+y-6 =-3
X+y = -3+6
X+y = 3
X-y = 7
--------------(-)
2y = 4
Y =4/2
Y = 2

X+2+(-6) = -3
X+(-4) = -3
X = -3+4
X = 1

Jadi nilai x,y dan z
X = 1
Y = 2
Z = -6