Solve: x−y=0,x+y=0,z=1x - y = 0, x + y = 0, z = 1x−y=0,x+y=0,z=1.
(0,0,1)(0, 0, 1)(0,0,1)
Infinitely many
No solution
(1,1,1)(1, 1, 1)(1,1,1)