How do you know if a function is not a function?

Asked by Mary Ibarra

Use the vertical line test to determine whether or not a graph represents a function. If a vertical line is moved across the graph and, at any time, touches the graph at only one point, then the graph is a function. If the vertical line touches the graph at more than one point, then the graph is not a function.

Andrew Henderson, BA Contributor
Andrew Henderson
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