The vertical line test is a simple test to determine if a graph represents a function.
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If you can draw at least one vertical line that crosses the graph more than once, the graph does not represent a function. Here are a couple of videos explaining the vertical line test.
video by Krista King Math |
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video by PatrickJMT |
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Here is a more recent video from one of our favorite instructors that explains the vertical line test with lots of examples.
video by Prof Leonard |
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Really UNDERSTAND Precalculus
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