I'm lost and i really need on learning how to solve this problem

the answer is d. (1.2, -4.7) on edgn

hope this !

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.