TI-92 Help -- Graphing Parametric Functions

To graph a parametric function start at the home screen and press MODE to get to the MODE screen. It should be set as shown at the right with the Graph option set at PARAMETRIC.
If the Graph option is set differently, arrow right using the cursor pad to see the submenu shown in the screen at the right. Select the PARAMETRIC Graph mode using the cursor pad and then press ENTER. Then press ENTER again to save the new MODE. Note: You must set the Graph mode to PARAMETRIC using the MODE menu as described above before setting the WINDOW settings as described below.
Next press Green-diamond WINDOW to get to the WINDOW screen as shown at the right. This screen allows you to set the following items. tmin -- the low end of the range for the time variable, t. tmax -- the high end of the range for the time variable, t. tstep -- the length of each step for the time variable, t. xmin -- the low end of the x-axis range. xmax -- the high end of the x-axis range. xscl -- the distance between x-axis tick marks. ymin -- the low end of the y-axis range. ymax -- the high end of the y-axis range. yscl -- the distance between y-axis tick marks. After setting the options as you want them, exit by pressing Green-diamond HOME .
Now press Green-diamond Y= to get to the Y= screen shown at the right. Enter the functions, x(t) and y(t), that you want to graph. Note that you can enter several pairs of functions to graph several parametric curves.
Finally press Green-diamond GRAPH to see the graph shown at the right.