Question

look at this table:
x | y
2 | 3
3 | -5
7 | -3
is this relation a function?
yes no

Explanation:

Step1: Recall function definition

A relation is a function if every input $x$ has exactly one output $y$.

Step2: Check x-values in table

The $x$-values are 2, 3, 7. Each $x$ has only one corresponding $y$-value.

Answer:

yes