document.write( "Question 882853: example of not function \n" ); document.write( "
Algebra.Com's Answer #533151 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
\"x%5E2%2By%5E2=9\"
\n" ); document.write( "It's a circle centered at (0,0) with a radius of 3.
\n" ); document.write( "It's not a function because for \"x=0\", there are two solutions for y(y=3 and y=-3).
\n" ); document.write( "This violates the definition of function which states there is one unique value of y for each x.
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