Chapter 3: Function Graphing 120
4. When you have defined the box, press Í to replot the graph.
To use ZBox to define another box within the new graph, repeat steps 2 through 4. To
cancel ZBox, press ‘.
Zoom In, Zoom Out
Zoom In, Zoom OutZoom In, Zoom Out
Zoom In, Zoom Out
Zoom In magnifies the part of the graph that surrounds the cursor location. Zoom Out
displays a greater portion of the graph, centered on the cursor location. The XFact and
YFact settings determine the extent of the zoom.
To zoom in on a graph, follow these steps.
1. Check XFact and YFact; change as needed.
2. Select 2:Zoom In from the ZOOM menu. The zoom cursor is displayed.
3. Move the zoom cursor to the point that is to be the center of the new viewing
window.
4. Press Í. The TI-83 Plus adjusts the viewing window by XFact and YFact;
updates the window variables; and replots the selected functions, centered on the
cursor location.
5. Zoom in on the graph again in either of two ways.