Texas Instruments TI-83 PLUS - Manual (Page 136)

TI-83 Plus Function Graphing 133
value displayed at the bottom of the screen actually may not be a point
on the function. To move the cursor along a function, use
r .
The coordinate values displayed as you move the cursor approximate
actual math coordinates, *accurate to within the width and height of the
pixel. As
Xmin , Xmax , Ymin , and Ymax get closer together (as in a Zoom
In ) graphing accuracy increases, and the coordinate values more closely
approximate the math coordinates.
Free- moving cursor “on” the
curve