X+y+z=-1 x-y+3z=-17 2x+y+z=-2 x= -1-y-z 3z-2y-z-1=-17, 2(z-y)=-16, z-y=-8, z= y-8 2(-1-y-y+8)+y+y-8=-2, 2y-2-4y+16-8=-2, -2y=-2+2-16+8, -2y=-8,

**y=4**z=4-8,**z=-4**x=-1-4+4,**x=-1**__x=-1, y=4,z=-4__