Question

look at this table:
x | y
-16 | 18
1 | 18
7 | 15
18 | 8
is this relation a function?
yes no

Explanation:

A relation is a function if every input (x-value) has exactly one corresponding output (y-value). Checking the table, each x-value (-16, 1, 7, 18) maps to only one y-value, even though two x-values share the same y-value. This satisfies the definition of a function.

Answer:

yes