document.write( "Question 616549: Solve the system by substitution.
\n" ); document.write( "x= -y + 12
\n" ); document.write( "3X - y= 6
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Algebra.Com's Answer #387766 by Alan3354(69443)\"\" \"About 
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Solve the system by substitution.
\n" ); document.write( "x= -y + 12
\n" ); document.write( "3X - y= 6
\n" ); document.write( "--------------
\n" ); document.write( "Sub for x in the 2nd equation.
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