State whether each table of values represents a function. 1) 3) X -12 -10 0 5 8 15 X 4 1 4 16 10 y 2 10 -2 -6 -11 -15 y -20 -17 -14 5 0 2) 4) X 9 -20 -6 -17 9 11 -15 -11 -14 -9 -1 y -18 0 1 16 17 19 y 18 18 18 18 18​