Determine Whether the Relation Is Also a Function $\{ ( - 5 , - 4 ) , ( - 2 , - 3 ) , ( 1 , - 5 ) , ( 5 , - 7 ) \}$

True/False

Determine whether the relation is also a function.
- $\{ ( - 5 , - 4 ) , ( - 2 , - 3 ) , ( 1 , - 5 ) , ( 5 , - 7 ) \}$