How do we make a graph?

It depends on which type of graph you want, but here's one:

so first you might want some square paper, then draw axis (x and y). then you can put measurements on it. 
                 2
                 1
-4 -3 -2 -1 0 1 2 3 4 
                 -1
              -2 
and so on

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.