Question

look at this table:
x | y
3 | 2
8 | -1
-7 | 2
is this relation a function?
yes no

Explanation:

A relation is a function if each input (x-value) has exactly one output (y-value). In the table, the x-value 3 maps to y=2, x=8 maps to y=-1, and x=-7 maps to y=2. No x-value is paired with more than one y-value.

Answer:

yes