Question

look at this table:

x	y
-1	6
13	0

is this relation a function?
yes
no
submit

Explanation:

Step1: Recall function definition

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

Step2: Check $x$-values in table

The $x$-values are $9$, $-1$, $13$. Each $x$-value maps to only one $y$-value: $9\to9$, $-1\to6$, $13\to0$. No $x$-value repeats with different $y$-values.

Answer:

yes