Select all the examples that describe a function:

1.		2.		3.		4.
5. (4,0),(3,1),(12,5),(4,-6),(-2,4)		6. Input,x -2 -1 0 1 3 2 Output,y 2 9 5 3 1 8		7. (0,0),(3,1),(12,5),(4,-6),(-2,4)		8. Input,x -5 -1 -1 1 2 5 Output,y 7 9 2 3 1 8