Select all the relations which represent a function. A. (1,3), (2,5), (2,7), (4,9)
B. (1,3), (2,5), (3,7), (4,9)
C. (1,3), (1,5), (1,7), (4,9)
D. (1,3), (2,3), (3,3), (4,3)
E. (1,2), (2,5), (2,1), (4,5)

please help

(B), (D)

Step-by-step explanation:

A. (1,3), (2,5), (2,7), (4,9) NOT a function

B. (1,3), (2,5), (3,7), (4,9) - YES, it's a function

C. (1,3), (1,5), (1,7), (4,9) NOT a function

D. (1,3), (2,3), (3,3), (4,3) - YES, it's a function

E. (1,2), (2,5), (2,1), (4,5) NOT a function

one that is bigger than 3 1/2

understand that i don't know the answers

will someone answer his question