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Mathematics 9 Online
OpenStudy (ttop0816):

Which of the following graphs is not a function? https://media.glynlyon.com/g_alg01_2013/3/pg46b.gif https://media.glynlyon.com/g_alg01_2013/3/36a.gif

OpenStudy (anonymous):

Use the vertical line test. If you draw a vertical line through the graph, it should not cross twice. The circle is not a function, because drawing a vertical line through results in two intersections

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