Chapter 17: Activities 511
Now compare the graph of the amount of interest with the graph of the amount of
principal for each payment.
4. Press z. Set
Par and Simul.
5. Press o. Turn off all functions and stat plots. Enter these equations and set the
graph styles as shown.
Note: GPrn( and GInt( are located on the FINANCE menu (APPS 1:FINANCE).
6. Press p. Set these window variables.
Note: To increase the graph speed, change Tstep to 24.
7. Press r. After the graph is drawn, press
240 Í to move the trace cursor to
T=240, which is equivalent to 20 years of payments.
Tmin=1
Tmax=360
Tstep=12
Xmin=0
Xmax=360
Xscl=10
Ymin=0
Ymax=1000
Yscl=100
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