(multiple ansewrs)
Select all the correct answers.
Which tables represent constant functions?

x y
2 -1
2 0
2 1

x y
2 -3
4 -7
6 -11

x y
2 3
4 3
6 3

x y
1 3
2 12
3 27

x y
1 -1
2 -1
3 -1