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3y+2z=-1
2x-3z=1
3y+2z=-1 ×3
2x-3z=1 ×2
9y+6z=-3
4x-6z=2 +
9y+4x=-1
1x+2y=0 ×4
9y+4x=-1 ×1
4x+8y=0
9y+4x=-1 -
-y=1
y=-1
x+2y=0
x-2=0
x=2
3y+2z=-1
-3+2z=-1
2z=2
z=1
x,y,z
2,-1,1
4x+9y
8-9
-1