Which set of ordered pairs below is a function? 1.) {(3 , 3), (6 , 1), (2 , 3)} 2.) {(4 , 7), (2 , 8), (4 , 2)} 3.) {(9 , 6), (3 , 1), (7 , 3)} i have been on this problem for awhile now and still can't figure it out.