Question

Is the relation a function?

Select Yes or No for each relation.

Relation Yes No

(2, 2), (3, 3), (4, 4), and (5, 5)

(1, 2), (1, 3), (1, 4), and (1, 5)

(2, 1), (3, 1), (4, 1), and (5, 1)

​(2, 2), (2, 3), (5, 4), and (5, 5)​

Answer 1

Yes

No

Yes

No

Explanation:

If you see the same number used more than once as an x-coordinate, then it is not a function. If all x-coordinates are different, then it is a function.

(2, 2), (3, 3), (4, 4), and (5, 5) Yes. All x-coordinates are different.

(1, 2), (1, 3), (1, 4), and (1, 5) No. The same number is used more than once as an x-coordinate.

(2, 1), (3, 1), (4, 1), and (5, 1) Yes. All x-coordinates are different.

​(2, 2), (2, 3), (5, 4), and (5, 5)​ No. 2 is used more than once for x, and the same happens with 5.