Question

look at this table:

x	y
20	7
7	6
13	1

is this relation a function?

yes no

Explanation:

Step1: Recall the definition of a function

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

Step2: Check the x - values in the table

The x - values given are 4, 20, 7, and 13. Each of these x - values appears only once. So for each x - value, there is exactly one corresponding y - value.

Answer:

yes