## Intermediate Algebra for College Students (7th Edition)

Not a function. Domain: $\{13,15\}.$ Range: $\{14,16,17\}.$
Not every $x$ value has a unique $y$ value ($x=13$ has $y=14$ and $y=17$), hence it is not a function. Domain: $\{13,15\}.$ Range: $\{14,16,17\}.$