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Mathematics 12 Online
OpenStudy (melodyeason74):

Solve the system by substitution. 2y + z − 9 = 0, 3x = 3y + 3z, y = x − 5

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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