Determine whether the relation is a function. explain. {(5, 9), (4, 8), (–7, 4), (0, 4), (2, 4), (3, 9), (–3, 8)} a. yes, each x-value is paired with exactly one y-value. b. no, there is a y-value paired with more than one x-value. c. no, there are no negative y-values. d. no, there is an x-value paired with more than one y-value. select the best answer from the choices provided