Question

Resolución por sustitución
X=1
2x-y=4
-3x+2y-2z=8

Answer 1

X=1
2x-y=4
2(1)-y=4
2-4=y
y=-2
-3x+2y-2z=8
-3(1)+2(-2)-2z=8
-3-4-2z=8
-2z=8+7
z=-7.5