SOLUTION: How do you know if the inverse of a graph is not a function by looking at a graph?

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Question 453346: How do you know if the inverse of a graph is not a function by looking at a graph?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
By observing that it passes both the vertical line test
(necessary for being a function) and also the horizontal
line test (for having an inverse which is a function.

This is explained well at this Iowa site:

http://www.uiowa.edu/~examserv/mathmatters/tutorial_quiz/geometry/vertandhorizlinetests.html

Edwin