SOLUTION: How do I determine the graph on a coordinate axis to be a function?

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Question 993704: How do I determine the graph on a coordinate axis to be a function?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Use the vertical line test. Take a piece of paper with an edge parallel to the y-axis and move it across the graph. The paper should touch the graph no more than once.
y=x^2 is a function.
x=y^2 is not a function.
Circles are not functions.