# Which of the following graphs represent function

We will use the Vertical Line Test to check if the graphs represent functions or not.

The

**vertical line test**can be used to determine whether a graph represents a function. A vertical line includes all points with a particular x value. The y value of a point where a vertical line intersects a graph represents an output for that input x value. If we can draw

*any*vertical line that intersects a graph more than once, then the graph does

*not*define a function because that x value has more than one output. A function has only one output value for each input value.

Regards!

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