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OpenStudy (anonymous):
Use the substitution method to solve the following system of equations. x + 2y - z = 7 4x - y + 3z = -2 2x + 2y - z = 9 Your choices (2, 1, 3) (2, 1, -3) (-2, 1, -3) (-2, -1, 3) im busy I just need the answer first one will get Best Response.
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OpenStudy (anonymous):
2,1,-3
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