document.write( "Question 345586: Solve by using the substitution method
\n" ); document.write( "x+y=56
\n" ); document.write( "x+3y=56
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Algebra.Com's Answer #247163 by rfer(16322)\"\" \"About 
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56-y+3y=56
\n" ); document.write( "2y=0
\n" ); document.write( "y=0
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\n" ); document.write( "x=56
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