So you don’t need a graph, but a coordinate system. And that is actually very easy to do.
If you need both axis to be 1000, you can have the window size be 100 and then scale it. Inside a “for i < 10” loop just call text with the right number(in this case i * 100) and i*100 depending on the axis, for both sides. Then just do point(x, y) like you did… And that should be it… If you want the previous points to disappear, use background(255) and if not, don’t use it.