Question

look at this table:
is this relation a function?
yes
no

Explanation:

Step1: Recall function definition

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

Step2: Check duplicate $x$-values

Look at the table: $x=9$ appears twice, with $y=17$ and $y=4$.

Step3: Evaluate against function rule

Since one $x$-value maps to two different $y$-values, the relation fails the function test.

Answer:

no