SOLUTION: is x^2+y^2=64 a function?

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Question 675405: is x^2+y^2=64 a function?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
No it is not because solving for y gives you y+=+sqrt%2864-x%5E2%29 or y+=+-sqrt%2864-x%5E2%29 which both fail the vertical line test (if you plot them both at the same time).