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OpenStudy (melodyeason74):
Solve the system by substitution. 2y + z − 9 = 0, 3x = 3y + 3z, y = x − 5
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OpenStudy (phi):
as a first step, it makes sense to simplify 3x = 3y + 3z can you do that ? (divide both sides and all terms by 3) what do you get ?
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