SOLUTION: Solve the system of equations 2x-2y-2z=3,x+4y-z=2, and -2x-8y+2z=-4. I tried to plot it on the graph but could not solve for z. Thank you I appreciate your help.

Question 976079: Solve the system of equations 2x-2y-2z=3,x+4y-z=2, and -2x-8y+2z=-4. I tried to plot it on the graph but could not solve for z. Thank you I appreciate your help.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
2x-2y-2z=3
x+4y-z=2
-2x-8y+2z=-4
---------------
2x -2y-2z=3
-2x-8y+2z=-4
----------------- Add
-10y = -1
y = 1/10 ********************
-----------
x+4y-z=2 Eqn A
-2x-8y+2z=-4 Eqn B
---
Eqn B is -2 times Eqn A
---> dependent, no unique solutions for x or z.

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