document.write( "Question 359858: 2y^2 - x^2 = 1
\n" ); document.write( "y+1 = x\r
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Algebra.Com's Answer #256770 by robertb(5830) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"2y%5E2+-+x%5E2+=+1\"$
\n" ); document.write( " $\"y%2B1+=+x\"$ . substitute the bottom equation into the top equation:
\n" ); document.write( " $\"2y%5E2+-%28y%2B1%29%5E2+=+1\"$ ,
\n" ); document.write( " $\"2y%5E2+-y%5E2+-+2y-1+=+1\"$ ,
\n" ); document.write( " $\"y%5E2+-2y-2+=+0\"$ ,
\n" ); document.write( " $\"y+=+%282+%2B-+sqrt%28+2%5E2-4%2A1%2A%28-2%29+%29%29%2F%282%2A1%29\"$ ,
\n" ); document.write( " $\"y+=+%282+%2B-+sqrt%28+12+%29%29%2F2\"$ ,
\n" ); document.write( " $\"y+=+%282%2B-2sqrt%283%29%29%2F2\"$ ,
\n" ); document.write( " $\"y+=+1%2B-sqrt%283%29\"$ . Then $\"x+=+2%2B-sqrt%283%29\"$ . \n" ); document.write( "

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