#176 Explain how the vertical line test is used to determine

Explain how the vertical line test is used to determine - Math

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Explain how the vertical line test is used to determine whether a graph represents a function.
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Free Chegg Answer

If any vertical line intersects a graph in more than one point, the graph does not define. This is called vertical line test.
A curve in the -plane is the graph of a function of , if and only if no vertical line intersects the curve more than once.

Let’s us take an example,

From the graph, the line drawn parallel to -axis cuts the graph at only one point.
Therefore, 

Let’s us take an another example,

From the graph, the line drawn parallel to -axis cuts the graph at more than one point. Two values of  correspond to one-value.
Therefore,