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Look at this set of ordered pairs:\newline(7,9)(7, 9)\newline(0,9)(0, 9)\newline(7,ext–8)(7, ext{–}8)\newlineIs this relation a function?\newlineChoices:\newline(A) yes\newline(B) no

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Full solution

Q. Look at this set of ordered pairs:\newline(7,9)(7, 9)\newline(0,9)(0, 9)\newline(7,ext–8)(7, ext{–}8)\newlineIs this relation a function?\newlineChoices:\newline(A) yes\newline(B) no
  1. Check xx-values: Check xx-values in the ordered pairs: (7,9)(7, 9), (0,9)(0, 9), (7,–8)(7, –8).\newlinexx-values are 77, 00, 77.
  2. Notice repeated xx-value: Notice that the xx-value 77 is repeated with different yy-values.
  3. Identify unique yy-value requirement: A function must have a unique yy-value for each xx-value. Since 77 maps to two different yy-values, it's not a function.
  4. Relation not a function: So, the relation is not a function.

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