To see the XY value of a point on your graph, there are two things that you can do. You can either use the Display value on click option or you can use the Digitize option. Both are discussed below.
To display the value on click, choose File | Preferences/Defaults. In the General Options section, open the Plot settings section. Check the Display value on click box.
Click OK. Now when you click on a point on the graph,
the XY values will be shown in the status bar.
You can also use the Graph | Digitizing | Digitize or Graph | Digitizing | Digitize Fixed commands to get XY values from a graph.