Question

How do you find the domain of the function {(3,1), (5,6), (8,-3), (7,-3)}?

Answer 1

Your function appears to be a mapping of 4 `x` values into 4 `y` values. Assuming this is what you intended (and it certainly would be valid)
then the domain of the function is the set of `x` values
`{3,5,8,7}`