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A. Determine if the following set of ordered pairs illustrates specifies a function.
1. {(2, 3), (1, 5), (3, 1), (-1, 0)}
2. {(2, -1), (2, 5), (-3, 7), (-10, 0)}
3. {(-2, -3), (-9, 5), (-9, 4), (-1, 10)}
4. {(2, 5), (1, 5), (3, 5), (-1, 5)}
5: {(3, 3), (3, 5), (3, 1), (3, 0)}
6. {(1, 2), (2, 3), (3, 4), (4, 5)}
7. {(7,2), (-6, 1), (4, 4), (-7, 4)}
8. {(12, -15), (2, -15), (-3, -15), (14,-15)}
9. {(-5, 2), (2, 3), (-5, 4), (4, -5)}
10. {(-1,-2), (-2, -3), (-3, -4), (-4,- 5)}