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Functions and Relations 1
A
B
Result
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Click "Yes" if the given relation is a function; otherwise, click "No."

1. {(1, 4), (1, 5), (2, 3)}
Yes
No
Answer: No; the first coordinate 1 is paired with two different second coordinates, namely, 4 and 5.
2. {(1, 2), (−1, 3), (3, 4)}
Yes
No
Answer: Yes; every first coordinate is paired with exactly one second coordinate.
3. {(A, C), (C, E), (A, B)}
Yes
No
Answer: No; the first coordinate A is paired with two different second coordinates, namely, C and B.
4. {(B, C), (D, C), (E, C)}
Yes
No
Answer: Yes; every first coordinate is paired with exactly one second coordinate.
5. {(1, 1), (2, 2), (3, 3)}
Yes
No
Answer: Yes; every first coordinate is paired with exactly one second coordinate.
6. {(1, 1), (1, −1)}
Yes
No
Answer: No; the first coordinate 1 is paired with two different second coordinates, namely, 1 and –1.
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