3x+2y=1 (1)2x-y+2z=-4 (2)x+2y-z=3 (3)(1)+(2)×24x+3y=2 (4)(4)-(1)x+y=1 (5)(1)-(5)×23x+2y-2x-2y=1-2x=-1y=1-x=2z=x+2y-3=0
x=-1,y=2,z=0
x=-1 y=2 z=0
