SOLUTION: example of not function

Question 882853: example of not function
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

It's a circle centered at (0,0) with a radius of 3.
It's not a function because for , there are two solutions for y(y=3 and y=-3).
This violates the definition of function which states there is one unique value of y for each x.
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