Decide Whether the Relation Is a Function $\{ ( 1,3 ) , ( 3 , - 6 ) , ( 5 , - 9 ) , ( 7,6 ) , ( 11,3 ) \}$

Multiple Choice

Decide whether the relation is a function.
- $\{ ( 1,3 ) , ( 3 , - 6 ) , ( 5 , - 9 ) , ( 7,6 ) , ( 11,3 ) \}$

A) function
B) not a function