Question

look at this table:
x
-16
16
-20
16
y
0
20
6
11
is this relation a function?
yes no
submit
work it out
not feeling ready yet? these can help:
input/output tables: find the rule (9.3)
lesson: relations and functions

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 $x$-values: $-16, 16, -20, 16$. The value $16$ appears twice, with different $y$-values ($20$ and $11$).

Answer:

no