Is the Set of Ordered Pairs a Function $$\{ ( 2,3 ) , ( 2,9 ) , ( 10,11 ) , ( 13,15 ) \}$$

Short Answer

Is the set of ordered pairs a function? $$\{ ( 2,3 ) , ( 2,9 ) , ( 10,11 ) , ( 13,15 ) \}$$ __________ (Answer function or not a function )