SOLUTION: Solve by the addition method 4x+5y+z=7 2x-y+2z=23 x+2y+2z=10

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Question 1053313: Solve by the addition method
4x+5y+z=7
2x-y+2z=23
x+2y+2z=10
Answer by Alan3354(69443) About Me  (Show Source):
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Solve by the addition method
4x+5y+z=7
2x-y+2z=23
x+2y+2z=10
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Multiply the 1st eqn by -2, then add it to the 2nd & 3rd eqns.
That will leave 2 eqns in x & y.