document.write( "Question 604177: -5x-2y=21 y=2x+6 \n" ); document.write( "
Algebra.Com's Answer #380984 by alicealc(293)\"\" \"About 
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-5x-2y=21
\n" ); document.write( "y=2x+6\r
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\n" ); document.write( "\n" ); document.write( "substitute y=2x + 6 into the first equation:
\n" ); document.write( "-5x - 2*(2x+6) = 21
\n" ); document.write( "-5x - 4x - 12 = 21
\n" ); document.write( "-9x - 12 = 21
\n" ); document.write( "-9x = 21 + 12
\n" ); document.write( "-9x = 33
\n" ); document.write( "x = 33/-9 = -11/3\r
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\n" ); document.write( "\n" ); document.write( "y = 2x + 6 = 2*(-11/3) + 6 = -22/3 + 6 = -22/3 + 18/3 = -4/3\r
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\n" ); document.write( "\n" ); document.write( "so the solution is:
\n" ); document.write( "x = -11/3
\n" ); document.write( "y = -4/3
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