SOLUTION: Solve each system by substitution -x-y-3z=-9 Z=-3x-1 X=5y-z+23

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Question 1101280: Solve each system by substitution
-x-y-3z=-9
Z=-3x-1
X=5y-z+23
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Sub for z in the 1st and 3rd equations.