Determine Whether the Function Is a One-To-One Function $\mathrm { f } = \{ ( 6,3 ) , ( 7,3 ) , ( 8 , - 9 ) , ( 9,1 ) \}$

Multiple Choice

Determine whether the function is a one-to-one function.
- $\mathrm { f } = \{ ( 6,3 ) , ( 7,3 ) , ( 8 , - 9 ) , ( 9,1 ) \}$

A) one-to-one
B) not one-to-one