Texas Instruments TI-83 PLUS - Manual (Page 585)

TI-83 Plus Activities 582
4. Press s to graph the equations. Watch closely as they are
plotted. Notice that the ball and the ferris wheel passenger appear to
be closest where the paths cross in the top-right quadrant of the ferris
wheel.
5. Press p . Change the viewing window to concentrate on this
portion of the graph.
Tmin=1 Xmin=0 Ymin=10
Tmax=3 Xmax=23.5 Ymax=25.5
Tstep=.03 Xscl=10 Yscl=10
6. Press r . After the graph is plotted, press ~ to move near the
point on the ferris wheel where the paths cross. Notice the values of
X , Y , and T .