document.write( "Question 507175: My problem is the following:\r
\n" ); document.write( "\n" ); document.write( " $\"x%5E2%2Bxy%2By%5E2=9\"$ \r
\n" ); document.write( "\n" ); document.write( "Could you help me isolate y?
\n" ); document.write( "My work so far is:\r
\n" ); document.write( "\n" ); document.write( " $\"%28y%2B3x%29%2A%28y-2x%29=-7x%5E2%2B9\"$ \n" ); document.write( "

Algebra.Com's Answer #340360 by Edwin McCravy(20059) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "What you did was mathematically correct but it doesn't help\r\n" );
document.write( "isolate y.\r\n" );
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document.write( "    x² + xy + y² = 9\r\n" );
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document.write( "First get 0 on the right\r\n" );
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document.write( "x² + xy + y² - 9 = 0\r\n" );
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document.write( "Rearrange in descending powers of y:\r\n" );
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document.write( "y² + xy + x² - 9 = 0 \r\n" );
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document.write( "Think of it as a quadratic equation in y this way:\r\n" );
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document.write( "1y^2 + xy + (x²-9) = 0\r\n" );
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document.write( "Then use the quadratic formula \r\n" );
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document.write( "where a = 1, b = x, c = (x²-9)\r\n" );
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document.write( "Edwin

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