SOLUTION: Does the equation y^2=16x define y as a function of x?

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Question 345493: Does the equation y^2=16x define y as a function of x?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
y%5E2=16x+
y=0+%2B-+sqrt%2816x%29
y=0+%2B-+4sqrt%28x%29
However, y is not a proper function.
By definition, a function provide a unique y value for each x value.
This relation provides two y value for each x value.