document.write( "Question 459557: Solve the linear system:
\n" ); document.write( "5x-y=7
\n" ); document.write( "x=-4y+16
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Algebra.Com's Answer #315132 by Alan3354(69443)\"\" \"About 
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5x-y=7
\n" ); document.write( "x=-4y+16
\n" ); document.write( "---------
\n" ); document.write( "Sub for x in the 1st eqn
\n" ); document.write( "5(-4y+16) - y = 7
\n" ); document.write( "-20y + 80 - y = 7
\n" ); document.write( "-21y = -73
\n" ); document.write( "y = 73/21
\n" ); document.write( "--------------
\n" ); document.write( "Sub for y in the 2nd eqn
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