Question

http://prntscr.com/dahr6f

Answer 1

What did you get?

Answer 2

http://www.mathsisfun.com/sets/function-floor-ceiling.html

I think this would help you.

Answer 3

I have less than 5 min to go!

Answer 4

@narissa
The ceiling function means that
If the value of x is an integer, there is no change.
Otherwise round the value UP to the next integer.
For example, \(\lceil -2\rceil = -2; \lceil -2.3\rceil =-2; \lceil 2.3\rceil =3\)
So you can start with x=-2, y=-2+3=1; x=-1, 0, ....2, draw a black full dot at these locations
The graph between the integers can be filled using the instructions given by the link @3mar posted for you. (read about the ceiling function)
I'll give you a headstart.

Answer 5

Thank you for good illustration and good explanation, teacher @mathmate!