Question

 (1 pt) Which of the following represents a function?     A.      X = 1 1 1 1 1              Y=2 3 4 5 6                                                           B.     X =1 2 1 2 1          Y= 0 1 2 3 4                                                    C.    X= -2 -1 0 -1 -2        Y= 2 3 4 5 6                                                                                                    D.    X= 1 2 3 4 5         Y= 5 4 3 2 1                                       

Answer 1

D, because for each element of the set of X, there is only one corresponding element of the set of Y.