Question

Which of the following is not a function?

A. {(4,5), (4,2), (5,4), (2,4)}
B. {(1,2), (2,3), (3,4), (4,5)}
C. {(1,2), (2,3), (3,3), (4,5)}
D. {(4,1), (5,1), (6,1), (7,1)}

Answer 1

The answer is (A)

Explanation:

Answer 2

A

Explanation:

it is A for for two outgoing (y)there is one in going(x)