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OpenStudy (mallorysipp234):
Solve the following system of equations. x + 3y - z = 2 x - 2y + 3z = 7 x + 2y - 5z = -21
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OpenStudy (math&ing001):
(2) + (3) => x=z-7 (4) Plug it in (1) and you get : y=3 (5) Plug (4) and (5) in (2) to get z and then find x.
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