Question

How do you do an x,y,z chart?

Answer 1

If you have xyz coordinates, you just graph it on a graph that looks like this:

Answer 2

As for how you do the table, it is like a x,y table.
When you first start out lots of times they will give you a z=axy+bx+cy
where a,b,c are constants
and you generate the table by entering values for x,y and it gives the z.