State whether each set of ordered pairs represents a function. 1. {(10,9),(?2,?16),(?6,7),(5,8),(8,?16),(?11,9)}; 2. {(?7,4),(?8,3),(?7,7),(?20,8),(5,9),(3,1),(2,6)}; 3. {(?13,4),(7,?15),(?13,9),(6,?12),(?18,0)}; 4. {(15,?3),(?6,9),(?3,0),(?1,16)}; 5. {(?4,3),(5,?9),(11,4),(9,6),(5,?3),(8,?9),(1,4)}; 6. {(12,?18),(15,1),(12,5),(0,9),(?5,?17)}; 7. {(6,0),(?12,?16),(?6,10),(20,?7)}; 8. {(?2,?4),(?8,3),(?7,?4),(?2,?8),(11,8),(9,?4)};
