Question

look at this table:

x	y
10	11
16	6
10	17
16	-12
19	11

is this relation a function?
yes no

Explanation:

Step1: Recall function definition

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

Step2: Check duplicate $x$-values

Look for repeated $x$-values:

• $x=10$ pairs with $y=11$ and $y=17$
• $x=16$ pairs with $y=6$ and $y=-12$

These $x$-values have multiple $y$-values.

Answer:

no