Answer both questions
1) which set is a function?
a) {(0,3), (3,0), (0,4), (4,0)}
b) {(0,2), (2,0), (4,6), (6,4)}
c) {(2,6), (3,6), (4,6), (2,0)}
d) {(6,2), (2,0), (4,6), (6,4)}

2)which set of ordered pairs does not represent a function?
a) (0, 1), (2, 2), (4, 8), (-2, 7), (5, 8)
b) (0, 1), (2, 2), (4, 8), (2, 7), (5, 8), (7, 9)
c) (-3, 6), (2, 7), (0, 5), (1, 5), (4, 9), (5, 4)
d) (-4, 2), (-3, 2), (-2, 2), (-1, 2), (0, 2), (1, 2)