document.write( "Question 72245: 6x+4y=20
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Algebra.Com's Answer #51644 by rmromero(383)\"\" \"About 
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document.write( "6x+4y=20\r\n" );
document.write( "4x-2y=4 \r\n" );
document.write( "solving systems of equations by using the elimination method with addition or subtraction or multiplication ...\r\n" );
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document.write( "Elimination Method: we are to eliminate one variable. Choose y\r\n" );
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document.write( "           6x + 4y = 20    Notice that if you add 4y and -2y, \r\n" );
document.write( "           4x - 2y = 4     we cant eliminate y.\r\n" );
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document.write( "Multiply 2 to 4x - 2y = 4\r\n" );
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document.write( "          6x + 4y = 20    \r\n" );
document.write( "        2(4x - 2y = 4)\r\n" );
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document.write( "         6x + 4y = 20    \r\n" );
document.write( "         8x - 4y = 8\r\n" );
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document.write( "         14x     = 28         Solve for x\r\n" );
document.write( "          14x/14 = 28/14\r\n" );
document.write( "               x = 2\r\n" );
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document.write( "Solve y by substituting x = 2 to any of the two equations\r\n" );
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document.write( "            4x - 2y = 4 , x = 2\r\n" );
document.write( "          4(2) - 2y = 4\r\n" );
document.write( "             8 - 2y = 4\r\n" );
document.write( "                -2y = -4\r\n" );
document.write( "                  y = 2\r\n" );
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document.write( "Check if the answers x = 2 and y = 2 makes the two equation true after\r\n" );
document.write( "substituting the value of x and y to the two equations.\r\n" );
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document.write( "Happy calculating\r\n" );
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document.write( "Rachel\r\n" );
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