Question

Which of the following is not a function?

a(3,1), (-3, 2), (4, 5), (-4, 5), (0, 0)
b(1, 2), (3, 4), (1, 5), (5, 7), (2, 4)
c(-4, 1), (-2, 3), (-1, 5), (0, 6), (-3, 5)
d(1, 3), (2, 3), (4, 5), (6, 4), (8, 9)
please help I'm timed.

Answer 1

B Ik someone already answered but it’s a for sure

Answer 2

B) because (1,2) and (1,5) have the same input (X-value) which means it’s not a function