Graphing selected functions, and changing selections.

Press the ZOOM key, then the number 4 to graph the functions y1, y3, and y5 (from the last screen) in the nice decimal window. The screen to the right shows the graphs of these three functions. Press Y= to return to the Function Screen. Then use the ARROW keys and the ENTER key to select only functions y2 and y3. Graph y2 and y3 in the standard window (ZOOM - 6). Remember that the value for both x and y in the standard window are between -10 and 10. The screen to the right shows the two graphs.