SOLUTION: Solve the system. x – 4y – z = 21 6x – 3y – z = –4 –x +2y –5z = 19

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Question 1109714: Solve the system.
x – 4y – z = 21
6x – 3y – z = –4
–x +2y –5z = 19
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the system.
x – 4y – z = 21
6x – 3y – z = –4
–x +2y –5z = 19
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Step 1, Subtract the 2nd eqn from the 1st.
Step 2, multiply the 1st eqn by 5, then subtract from the 3rd.
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z is gone.