document.write( "Question 367496: How do I solve the following systems of equations by using the addition method?
\n" ); document.write( "2x-y=3
\n" ); document.write( "x-2y=9
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Algebra.Com's Answer #261977 by robertb(5830)\"\" \"About 
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Multiply the top equation by -2: -4x+2y = -6.
\n" ); document.write( "Then add to the bottom equation: -4x+2y + x-2y = -6+9, or -3x = 3, or x = -1.
\n" ); document.write( "This makes the bottom equation -1-2y = 9, or -2y = 10, or y = -5.
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