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9-13.

Determine whether the graphs below are functions or not functions. Explain your reasoning. Homework Help ✎

A graph is only a function if there is no more than one -value for any given -value.

  1. 9-13 (a) graph

    Are there any points on this line segment that are above or below another point on the line segment? If there are, the graph is not a function.

    This graph is a function.

  1. 9-13 (b) graph

    See hint for part (a).

    This graph is not a function. Some -values are related to multiple values. For example, when is , can be or .

  1. 9-13 (c) graph

    See hint for part (a).

  1. 9-13 (d) graph

    See hint for part (a).

  1. 9-13 (e) graph

    See hint for part (a).

    This graph is not a function.

  1. 9-13 (f) graph

    See hint for part (a).