document.write( "Question 590137: how to solve this by using substitution
\n" ); document.write( "y=2x
\n" ); document.write( "x+y=12\r
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Algebra.Com's Answer #375046 by Alan3354(69443)\"\" \"About 
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how to solve this by using substitution
\n" ); document.write( "y=2x
\n" ); document.write( "x+y=12
\n" ); document.write( "------------
\n" ); document.write( "Sub 2x for y in the 2nd equation.
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