Question 222440: Determine whether each relation is a function. In addition, provide reasons for identifying a relation as a function.
1. {(3, 4), (5, 9), (9, 9), (2, 3)}
2. {(0, 0), (0, 1), (1, 4), (2, 4)}
3. {(2, 1), (4, 5), (8, 4), (1, 0)}
4. {(8, 3), (8, 0), (7, 7), (4, 7)}
Answer by vleith(2983)   (Show Source):
You can put this solution on YOUR website! 1 and 3 are functions.
2 and 4 are not functions since in both of those, a value for x (0 in number 2 and 8 in number 4), map to more than one value for y
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