A function is a rule that assigns each input exactly one output.

Is the following graph a function? (Show your work by using the vertical line test)
Is the following graph a function? (Show your work by using the vertical line test)
Is the following graph a function? (Show your work by using the vertical line test)
Give an example of a graph that is considered a function. (Show your work by using the vertical line test)
Give an example of a graph that is NOT considered a function. (Show your work by using the vertical line test)