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OpenStudy (anonymous):
1.) 2x + y = 3 2.) x - 2y = -1 If equation 1 is multiplied by 2 and then the equations are added, the result is
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OpenStudy (astrophysics):
\[(2x+y=3)*2 =...\] then add it to the second equation |dw:1444192913719:dw|
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