document.write( "Question 1179683: Solve by the addition method. (If there is no solution, enter NO SOLUTION. Use the parameters x and y as necessary.)\r
\n" ); document.write( "\n" ); document.write( "x + 5y = 12
\n" ); document.write( "2x + 7y = 15
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Algebra.Com's Answer #809379 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Instead of doing it for you, I'll do one exactly like it step-by-step.\r\n" );
document.write( "Use it as a model for doing your problem.\r\n" );
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document.write( " x + 7y = 24\r\n" );
document.write( "4x + 9y = 20\r\n" );
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document.write( "Multiply the first equation through by -4 to make the x become -4x\r\n" );
document.write( "so it will cancel out when adding it to 4x in the second equation.\r\n" );
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document.write( "-4x - 28y = -96\r\n" );
document.write( " 4x +  9y =  20\r\n" );
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document.write( "Then we add them term by term:\r\n" );
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document.write( "-4x - 28y = -96\r\n" );
document.write( " 4x +  9y =  20\r\n" );
document.write( "---------------\r\n" );
document.write( "     -19y = -76\r\n" );
document.write( "        y = (-76)/(-19)\r\n" );
document.write( "        y = 4\r\n" );
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document.write( "Substitute 4 for y in\r\n" );
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document.write( "   x + 7y = 24\r\n" );
document.write( " x + 7(4) = 24\r\n" );
document.write( "   x - 28 = 24\r\n" );
document.write( "        x = -4\r\n" );
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document.write( "Now do yours exactly the same way step by step.\r\n" );
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document.write( "Edwin
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