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College algebra

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If the domain and range of a function consists of real numbers, then you can graph it by plotting all ordered pairs (x, f(x)). Remember "y" = f(x). How can you tell by looking at a graph if it represents a function?

  • College algebra - ,

    It is easier to tell which graph not a function.

    If there exists any vertical line x=k that intersects the graph at more than one point, the graph is not a function. This is call the vertical line test.

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