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.