You can use tracing to display a cross-hair on the graph move it along an equation to find the x and y values at any point on the equation.

To turn tracing on, right click on the graph and select "Trace".

Once tracing is on, you can use the arrow keys to move left and right along the equations. Pressing the up or down arrow will move the cross-hair to the next equation.

If you trace all the way to the edge of the graph, it will automatically pan over so that the cross-hair will still be in view.