Hi, just can't get my head around how to draw these three graphs. Any help appreciated. Thanks In each case below, draw the graph of a function f that satisfies the given property. Give an example of a function f : N -> Z that is bijective/that is injective but not surjective/that is surjective but not injective. I just can't see how you can graph a function that maps natural numbers to integers. I thought maybe y=x, x>0 but im just not sure.