Question

Epresents a function?

{(2, 3), (3, 4), (5, 6), (2, 9)}
{(4, 2), (5,2), (6, 2), (9, 2)}
{(1, 2), (1, 3), (1, 4), (1, 5)}
{(-4, 9), (-8, -12), (-4, -15), (-8, -21)}

Answer 1

Only the second one

Explanation:

All of the others have multiple values for 'x'

a function can only have one value for each value of x

Example: the first one when x = 2 it has two 'y' values 3 and 9

Answer 2

No, it does not represent a function

Explanation:

A function can be described as a set of points where each x coordinate has 1 corresponding Y coordinate

1 has multiple different Y coordinates

2 has multiple different Y coordinates

-4 has multiple different Y coordinates