Question

Which relation is a function?

A.
(6, 5), (1, 1), (6, 4)

B.
(0, 1), (2, 3), (2, 5)

C.
(8, –2), (–2, 5), (6, 0)

D.
(–2, 3), (–5, 9), (–5, 3)

Answer 1

b

Answer 2

a

Answer 3

b

Answer 4

X values cannot repeat so C.

Answer 5

This is because, the first number, x, can only have one y. So, B for example can't be a function because 0 has 3 and 9, which is incorrect. A is the only one with one x with one y. :D
Source(s):

Answer 6

A relation is a function as long as it passes the vertical line test (i.e. no more than 1 point on any line x=a).

Answer 7

so it A

Answer 8

@SolomonZelman so it A