A great feature of g(Math) is the ability to plot points. You can plot points independently of the functions you are graphing. To plot a point enter the points in the box, separating each point with a comma. You must also enter them in the form {x,y}, note that it uses the curly braces and not the standard parentheses.

You can also enter points by selecting a table in your Doc and clicking the button Get Points From Table. It will populate the points with the first column being the x values and the 2nd column as the y values.

You can also get points from a plot that is already in your Doc. Click on the graph in your Doc, then click on the Edit from Doc button and it will populate the points that are in your graph if they exist.