If you are drawing your graph from scratch, using a Graph Box() and then using the Y function() for drawing your curve, you can simply add to your code and use the Marker() function to draw your points at the X,Y locations you want.
Another way to accomplish this would be to us the Graph Builder Platform to draw your scatterplot values, and then just add the Y Function() as a graphical addition( << add graphics script) to the Graph Builder output.
Jim