SOLUTION: determine whether Y is a function of X for x^2+y^2 =4

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Question 977407: determine whether Y is a function of X for x^2+y^2 =4
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, not a function.
y%5E2=4-x%5E2
y=0+%2B-+sqrt%284-x%5E2%29
So for any x value, you have two y values, which violates the definition of a function.