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9-92.
  1. Identify which of the relationships shown below is not a function. Explain your reasoning. Homework Help ✎

    1. x

      3

      8

      1

      9

      –1

      0

      y

      12

      4

      0

      4

      –3

      –8

    2. x

      5

      2

      –1

      0

      –15

      2

      y

      2

      0

      –11

      8

      –25

      1

A relationship is a function only if there is no more than one y-value for each x-value. Check the x-values in both tables to see to find any that appear multiple times. When you find a value for x that appears multiple times, check the corresponding y-values. If the y-values are different, then the relationship is not a function.

Relationship (b) is not a function. When x equals 2, y can equal 0 or 1.