Which of the following would NOT represent a function?

Question

a) {(1, 3), (2, 5), (5, 3), (7, 10)}
b) ((-1, 4), (2, 4), (0, 4), (9,4)]
c) ((-3,-2). (-1, 0), (3, 7), (6, 1)}
d) {(1, 12), (2, 8), (3, 1), (1,-4)]

Answer 1

a) {(1, 3), (2, 5), (5, 3), (7, 10)}
This does represent a function because each input value (x-value) is associated with exactly one output value (y-value).

b) ((-1, 4), (2, 4), (0, 4), (9,4)]
This also represents a function because each input value (x-value) is associated with exactly one output value (y-value).

c) ((-3,-2). (-1, 0), (3, 7), (6, 1)}
This represents a function because each input value (x-value) is associated with exactly one output value (y-value).

d) {(1, 12), (2, 8), (3, 1), (1,-4)]
This does NOT represent a function because the input value 1 is associated with two different output values (12 and -4).