(1,5) (2,5) (1,-5) (2,-5) is this a function​

A function is an expression in terms of a variable, usually x. Hence, that is not a function.

Step-by-step explanation:

What you have there are four sets of coordinates.

no

Step-by-step explanation:

(1,5) (2,5) (1,-5) (2,-5)

This is not a function

To be a function each x must only go to one y

x=1 goes to both 5 and -5

x=2 goes to both 5 and -5

It is not a function

b, i believe, but not sure.