Plz which set of ordered pairs represents y as a function of x? a) {(-9, 2), (0, 6), (1, -2), (-3, 6)} b) {(-1, 0), (4, 3), (-7, -3), (-1, -8)} c) {(3, 2), (-4, -2), (3, 1), (-4, 1)} d) {(5, 4), (2, 3), (1, 1), (2, 4)}

It is a cuz to  be a function the x (domain) can only have one y (range)  in d it is the number 2 in the 2nd and fourth set of ordered pairs in c it is 3 the first one and the 3rd in b it is -1 its the first and the last one 
hope i helped you if u dont mind can i have brainlest