document.write( "Question 741543: Solve by Substitution Method
\n" ); document.write( "2x-4y=3.8
\n" ); document.write( "3x-y=17.7
\n" ); document.write( "I solved it then I plug in the numbers but it didn't come out right so I need you help! \n" ); document.write( "
Algebra.Com's Answer #452048 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
2x - 4y =  3.8\r\n" );
document.write( "3x -  y = 17.7\r\n" );
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document.write( "Solve the second equation for y:\r\n" );
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document.write( " 3x - y = 17.7\r\n" );
document.write( "     -y = 17.7 - 3x\r\n" );
document.write( "    -1y = 17.7 - 3x\r\n" );
document.write( "    \"%28-1y%29%2F%28-1%29\" = \"17.7%2F%28-1%29\" - \"%283x%29%2F%28-1%29\"\r\n" );
document.write( "      y = -17.7 + 3x\r\n" );
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document.write( "Substitute (-17.7 + 3x) for y in the first equation:\r\n" );
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document.write( "           2x - 4y = 3.8\r\n" );
document.write( "2x - 4(-17.7 + 3x) = 3.8\r\n" );
document.write( "   2x + 70.8 - 12x = 3.8\r\n" );
document.write( "       -10x + 70.8 = 3.8\r\n" );
document.write( "              -10x = -67\r\n" );
document.write( "                 x = \"%28-67%29%2F%28-10%29\"\r\n" );
document.write( "                 x = 6.7  \r\n" );
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document.write( "Substitute (6.7) for x in\r\n" );
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document.write( "      y = -17.7 + 3x\r\n" );
document.write( "      y = -17.7 + 3(6.7)\r\n" );
document.write( "      y = -17.7 + 20.1\r\n" );
document.write( "      y = 2.4\r\n" );
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document.write( "Answer:  (x, y) = (6.7, 2.4)\r\n" );
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document.write( "Edwin
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