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12-90.

The graphs of several relations are shown below. Decide if each is a function. If the relation is not a function, explain why not. Homework Help ✎

  1. function graph a

    A relation is only a function if there is only one -value for each -value. Are there any -values on this graph that have multiple -values?

    This relation is a function.

  1. function graph b

    See the help for part (a).

    This relation is not a function. Be sure to explain why.

  1. function graph c

    See the help for part (a).