<PRE><B>Question 634824</B>
Solve for y to get 


&lt;img src=&quot;http://latex.codecogs.com/gif.latex?\LARGE y = \pm \sqrt{1-x^2}&quot; title=&quot;x&quot; /&gt;


Because we got that &quot;plus/minus&quot;, this means that each input produces 2 outputs...which means that y is NOT a function of x.


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