Stating the domain in set notation, we have
[tex]x=\mleft\lbrace-5,-1,-1,2\mright\rbrace[/tex]
Stating the range in set notation, we have
[tex]y=\mleft\lbrace-2,3,6,9\mright\rbrace[/tex]
It is a function because for every value of x, there is a corresponding unique value of y.
