document.write( "Question 449814: y=7-x;y^2+x^2=9 solve using system of equations algebraically. \n" ); document.write( "
Algebra.Com's Answer #309420 by robertb(5830)\"\" \"About 
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\"%287-x%29%5E2+%2B+x%5E2+=+9\"\r
\n" ); document.write( "\n" ); document.write( "\"49+-+14x+%2B+x%5E2+%2B+x%5E2+=+9\"\r
\n" ); document.write( "\n" ); document.write( "<==> \"2x%5E2+-+14x+%2B+40+=+0\"\r
\n" ); document.write( "\n" ); document.write( "<==> \"x%5E2+-+7x+%2B+20+=+0\"\r
\n" ); document.write( "\n" ); document.write( "Now use the quadratic formula to find the values of x.
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