document.write( "Question 1104044: x=5-9y
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Algebra.Com's Answer #718782 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "The given system is equivalent to THIS\r\n" );
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document.write( " x + 9y =  5,    (1)\r\n" );
document.write( "4x + 9y = -7,    (2)\r\n" );
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document.write( "Subtract eq(1) from eq(2) (both sides). You will get\r\n" );
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document.write( "4x - x = -7 - 5,   or\r\n" );
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document.write( "3x = - 12  ====>  x =  = -4.\r\n" );
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document.write( "Then from eq(1) 9y = 5 - x = 5 - (-4) = 9  ====>  y = 1.\r\n" );
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document.write( "Answer.  The solution is  (x,y) = (-4,1).\r\n" );
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