SOLUTION: what kind of symmetry indicates that a function will not have an inverse? why?

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Question 370514: what kind of symmetry indicates that a function will not have an inverse? why?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Ans: symmetry to the y-axis.
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Why: The inverse would be symmetric to the x-axis
and would therefore not be a function.
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Example:
y = x^2 is symmetric to the y-axis.
Its inverse is x = y^2 or y = +/-sqrt(x)
graph%28400%2C300%2C-10%2C10%2C-10%2C10%2Cx%5E2%29
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Cheers,
Stan H.