<span>A) 4x − 2y − z = −5
B) x − 3y + 2z = 3
C) 3x + y − 2z = −5 Looking at ALL 4 solutions, x =0 in all of them. So, let's say x = 0, eliminate the "x's" and just keep equations B and C </span> <span>B) -3y + 2z = 3
C) y − 2z = −5 </span>Add B) and C) -2 y = -2 y = 1