document.write( "Question 823057: Solve by substitution.
\n" ); document.write( "X=12-y
\n" ); document.write( "6x-3y=9
\n" ); document.write( "

Algebra.Com's Answer #495235 by faceoff57(108)\"\" \"About 
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Solve by substitution.
\n" ); document.write( "X=12-y
\n" ); document.write( "6x-3y=9
\n" ); document.write( "6(12 - y) - 3y = 9
\n" ); document.write( "72 - 6y - 3y = 9
\n" ); document.write( "-9y = 9 - 72
\n" ); document.write( "-9y = -63
\n" ); document.write( "Y = 7
\n" ); document.write( "X = 12 - 7
\n" ); document.write( "X = 5
\n" ); document.write( "(5,7)
\n" ); document.write( "
\n" );