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High School Mathematics - 2
Test of Functions: Vertical Line Test

The vertical line test
One way to tell if a graph is a function is the vertical line test, which states that if it is possible for a vertical line to meet a graph more than once, the graph is not a function.

Method to test a function:
Draw a line parallel to the y-axis. If this line cuts the graph at one distinct point, then it is a function otherwise it is not a function.