Question

Which relation is not a function?

(-4, 6). (0, 6). (7, 6), (4, 6), (-7, 6)
(1, 3), (3, 5). (5, 7). (7, 9). (9,1)
(4, 1). (8, 2). (12, 3). (16, 4), (20, 4)
(7,3), (7, 6), (7, 9), (7, 12) (7, 15)

Answer 1

Answer: D ( 7,3 7,6 7,9 7,12 7,15)

Explanation:

A- (-4, 0, 7, 3, -7) There are no repeating domains, therefore, this is a function

B- (1, 3, 5, 7, 9) The domain does not repeat, therefore this is a function

C- (4, 8, 12, 16, 20) The domain does not repeat, therefore this is a function

D- (7, 7, 7, 7, 7) The entire domain repeats, therefore this cannot be a function

Correct answer is D ( 7,3 7,6 7,9 7,12 7,15)