Question

look at this table:
x | y
-15 | 18
9 | 17
16 | 10
8 | 7
is this relation a function?
yes no

Explanation:

A relation is a function if every input (x-value) has exactly one unique output (y-value). Checking the table, each x-value (-15, 9, 16, 8) appears only once, with no repeated x-values paired with different y-values.

Answer:

yes