Texas Instruments TI-82 Manual page 10

A-10
TI-82/TI-83 Graphics Calculators
¥ If you want Ònice, friendlyÓ values displayed for x when tracing, set Xmin and Xmax so
that Xmax - Xmin is a multiple of 9.4, the width of the ZDecimal viewing screen. For
instance, if you set Xmin = 0 and Xmax = 18.8 in the example above, the exact values when
x = 5, x = 7, and x = 10 are displayed when you trace since 18.8 = 2(9.4). Try it!
1.1.7 EVALUATING OUTPUTS
actual output values of the equation, not estimated values such as those generally obtained
by tracing. Begin by entering the equation whose output you want to evaluate in the Y= list.
Using x as the input variable, enter the function in the
Y= list. Return to the home screen by pressing
( ) as many times as necessary.
MODE QUIT
TI-82 Go to the Y-VARS menu by pressing
( ).
Y-VARS
TI 83 Go to the Y-VARS menu by pressing
( ).
Y-VARS
Both Choose 1: Function by pressing
and choose 1: Y
(To choose another Y= location, simply press the num-
ber corresponding to that function.)
Y shows on your screen. Type the x-value at which you
1
want to evaluate the equation, and press
evaluate Y at x = 5.
1
(Note: You can, but do not have to, type in the closing
parentheses on the right.)
Evaluate Y at x = 7 by recalling the previous entry with
1
2nd ENTER
and typing over the 5, and press
The values obtained by this evaluation process are
by pressing or
1 1 ENTER
( ) , edit the 5 to 7 by pressing
ENTRY
2nd
2nd VARS
VARS
or ,
1 ENTER
.
. Now,
ENTER
.
ENTER
Copyright © Houghton Mifflin Company. All rights reserved.
x
Y1= 1000(1 + 0.05)
(You could use any of the 10
function locations.)