document.write( "Question 82523: Solve the system by addition or substitution.
\n" ); document.write( " –6x + 3y = 12
\n" ); document.write( " y = 2x + 3 \r
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–6x + 3y = 12 [re=write]
\n" ); document.write( "-6x+6x+3y=6x+12
\n" ); document.write( "3y=6x+12
\n" ); document.write( "3y/3=6x/3+12/3
\n" ); document.write( "y=2x+4
\n" ); document.write( ".
\n" ); document.write( "y=2x+4
\n" ); document.write( "y=2x+3
\n" ); document.write( "______\r
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\n" ); document.write( ".
\n" ); document.write( "(-1)y=2x+4
\n" ); document.write( "y=2x+3
\n" ); document.write( "______
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\n" ); document.write( "\n" ); document.write( ".
\n" ); document.write( "-y=-2=-4
\n" ); document.write( "y=2x+3
\n" ); document.write( "________
\n" ); document.write( "0y=0x+-1
\n" ); document.write( "o=-1 [untrue statement, so there is no solution or no points in common]
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\n" ); document.write( "Also, note that the lines have the same slope (2), therefore the lines are parallel and will never intersect.\r
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