Question

PLEASE HELP ME, I NEED YOU

Determine if the set of ordered pairs (x,y) represents y as a function of x (Yes, No)

A) {-4,2 , -2,9}
B) {(-4,2), (2,-2), (-4,9)}
C) {(-4,2), (2,-4), (9,9)}
D) {(-4,2), (-2,9), (-2,-4), (9,-2)}

Answer: All No except C, C is yes

Please explain why A, B, and D are no and C is yes

Answer 1

A function is a relation (a set of ordered pairs) where a given input cannot have two different outputs. The ordered pairs can be described as (input, output)

Answer 2

so you mean the y has to be different?

I don't get it still

Answer 3

here is an example of a function
{(1,1) (2,1) }

example of a non-function
{(1,1) (1,2) }

Answer 4

???

Answer 5

nvm i sort of kind of get it thx