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OpenStudy (anonymous):
how do you solve equations with multiple variable for example, x+y-2z=0, 3x+y=1,5x+3y+7z= 0
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OpenStudy (phi):
use elimination. see http://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/matrices_elimination/v/matrices--reduced-row-echelon-form-1
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