document.write( "Question 888789: Solve using Substitution method\r
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Algebra.Com's Answer #537681 by Alan3354(69443)\"\" \"About 
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Solve using Substitution method\r
\n" ); document.write( "\n" ); document.write( "2x+3y=-3
\n" ); document.write( "2x-y=6 --> y = 2x - 6
\n" ); document.write( "sub for y in the 1st eqn
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