X X X X X X X X X X X These are the points on my graph. The question says is the above relation a function? I think this is a function, but I dont know how to justify my answer. Also it says is the inverse of this a function? How do I know? Im thinking no because f(x) is already a function so it wont pass the horizontal line test, therefore the inverse will not be a function.?? Help me out please.