In Exercises 9 and 10, which sets of ordered pairs represent
functions from A to B? Explain.
9. A = {0, 1, 2, 3} and B = {-2, -1, 0, 1, 2}
(a) {(0, 1), (1, − 2), (2, 0), (3, 2)}
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(b) {(0, − 1), (2, 2), (1, − 2), (3, 0), (1, 1)}
(c) {(0, 0), (1, 0), (2, 0), (3, 0)}
(d) {(0, 2), (3, 0), (1, 1)}