Question

Х

15
9
18
9
y
17
9
4
Is this relation a function?
yes
no

Answer 1

The relation is not a function. This is because there is a domain value that leads to two range values. X=9 leads to y=9 and y=3 or (9, 9) and (9, 3). Therefore, by definition, this relation is not a function because every range value must be assigned a unique domain value. In other words, x cannot “cheat” and can only have one y “partner.”

Answer 2

This relation is NOT a function.
An input cannot have more than one output, and in this case, 9 has both outputs 9 and 3.
Therefore it is not a function