7
QuizMultiple Choice

Graphing in a Variety of Contexts — Unit test

Question 7 • WI-Mathematics Grade 8 A

Which answer explains whether the table of values represents a function?xy–4–5–22031–7–6–9

Answer
A
Yes, the values represent a function because each x-value is paired with only one y-value.
B
Yes, the values represent a function because each y-value is paired with only one x-value.
C
No, the values do not represent a function because the x-values are not in ascending order.
D
No, the values do not represent a function because there is no single rule that relates each pair of values.

Explanation

A relation is a function when every input x has exactly one output y. In the table, the x-values are −4, −2, 0, 1, and 6, and none repeats with a different y-value. Therefore, the table represents a function because each x-value is paired with only one y-value.

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