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OpenStudy (anonymous):
solve polynomios subtract please 7.8x-3.4y+z -9.2x+4.8y-2.1z
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OpenStudy (anonymous):
help me please
OpenStudy (anonymous):
(7.8x - 3.4y + z)2.1 -9.2x + 4.8y - 2.1z 16.38x - 7.14y + 2.1z -9.2x + 4.8y - 2.1z I'm going to add them to cancel out the z You should be able to figure out how to subtract from this. You would just switch the sign of every term from the second equation, then subtract.
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