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Are these functions? Explain using the vertical line test.

Are these functions? Explain using the vertical line test.-example-1

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The first graph is a function because if you perform the vertical line test (VLT) anywhere on the graph, it never intersects more than one point. The second graph is not a function because at x=3, there are two outputs, 12 and about 1.5.

User Thibaud Arnault
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