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TI-83 Plus Activities 594
6. Press
p
. Set these window variables.
Tmin=1 Xmin=0 Ymin=0
Tmax=360 Xmax=360 Ymax=1000
Tstep=12 Xscl=10 Yscl=100
Tip: 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.
The graph shows that for the 240th payment (
X=240
), 358.03 of the
800 payment is applied to principal (
Y=358.03
).
Note: The sum of the payments (
Y3T=Y1T+Y2T
) is always 800.
8. Press
†
to move the cursor onto the function for interest defined by
X2T
and
Y2T
. Enter
240
.
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