SOLUTION: How Do You Know If A Parabola Is A Function ?

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Question 559538: How Do You Know If A Parabola Is A Function ?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If +f%28x%29+ is the equation, then there can be only
1 value of +f%28x%29+ for each +x+, but there
can be 1 or 2 values of +x+ for a given
value of +f%28x%29+