document.write( "Question 1172228: What is the difference of the values of the two variables in this system of equations?\r
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Algebra.Com's Answer #797181 by ikleyn(52847) $\"\"$ $\"About$

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document.write( "Substitute  y = 2x+1  from the first equation to the second one\r\n" );
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document.write( "    x + 3*(2x+1) = 10\r\n" );
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document.write( "    x + 6x + 3 = 10\r\n" );
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document.write( "      7x       = 10-3 = 7\r\n" );
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document.write( "       x              = 7/7 = 1.\r\n" );
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document.write( "Then  from the first equation  y = 2*1 + 1 = 3.\r\n" );
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document.write( "The difference  x - y  is  1 - 3 = -2.\r\n" );
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document.write( "The difference  y - x  is   3 - 1 = 2.\r\n" );
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