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You can put this solution on YOUR website!
When I tried to solve the sample problem my answer was wrong 2x-1y=9 5x+5y=0 this is what I did 2x-1y=9
\n" ); document.write( " 5x+5y=0
\n" ); document.write( " 7x+4y=9 for substitution?
\n" ); document.write( "-----------
\n" ); document.write( "Using substition:
\n" ); document.write( "2x-1y=9
\n" ); document.write( "5x+5y=0 --> y = -x
\n" ); document.write( "Sub for y in the 1st eqn
\n" ); document.write( "2x - (-x) = 9
\n" ); document.write( "3x = 9
\n" ); document.write( "x = 3
\n" ); document.write( "y = -3
\n" ); document.write( "==========
\n" ); document.write( "Using elimination:
\n" ); document.write( "2x-1y=9
\n" ); document.write( "5x+5y=0 --> x + y = 0
\n" ); document.write( "------
\n" ); document.write( "2x- y = 9
\n" ); document.write( "x + y = 0
\n" ); document.write( "------------- Add
\n" ); document.write( "3x = 9
\n" ); document.write( "etc.\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "