document.write( "Question 883674: What are the solutions to this system of equations? \r
\n" ); document.write( "\n" ); document.write( "x^2 + y^2 = 5
\n" ); document.write( "y = 2x
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Algebra.Com's Answer #533681 by rothauserc(4718)\"\" \"About 
You can put this solution on YOUR website!
substitute 2x for y in the first equation
\n" ); document.write( "x^2 + (2x)^2 = 5
\n" ); document.write( "x^2 + 4x^2 = 5
\n" ); document.write( "5x^2 = 5
\n" ); document.write( "x^2 = 1
\n" ); document.write( "x = square root(1) = 1 or -1
\n" ); document.write( "y = 2x = 2 or -2
\n" ); document.write( "we have two solution sets
\n" ); document.write( "x = +1, y = +2 or
\n" ); document.write( "x = -1, y = -2 \r
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