Assign the value 2230 to the variable by using these keystrokes (see Figure I.7): 2230 STO X,T, .
Then press 2nd : to allow another expression to be entered on the same command line. Next press the
following keystrokes to evaluate and find January’s wages: 2nd Y-VARS 1 [Function] 1 [] ENTER. It
is not necessary to repeat all these steps to find the February wages. Simply press 2nd ENTRY to recall the
entire previous line, change 2230 to 1865, and press ENTER. Each time the TI-82 evaluates the function ,
it uses the current value of
Figure I.8: Function notation
Like your textbook, the TI-82 uses standard function notation. So, to evaluate when
press 2nd Y-
VARS 1 1 (2230) ENTER (see Figure I.8). Then to evaluate
press 2nd ENTRY to recall the last line, change 2230 to 1865, and press ENTER.
You may also have the TI-82 make a table of values for the function. Press 2nd TblSet to set up the table
(Figure I.9). Move the blinking cursor onto Ask beside Indpnt:, then press ENTER. This configuration
permits you to input values for one at a time. Now press 2nd TABLE, enter 2230 in the X column, and
press ENTER (see Figure I.10). Continue to enter additional values for X and the calculator automatically
completes the table with corresponding values of . Press 2nd QUIT to leave the TABLE screen.
Figure I.9: TblSet screen Figure I.10: Table of values
For a table containing values for 2, 3, 4, 5, and so on, set TblMin 1 to start at Tbl 1 to
increment in steps of 1, and both Indpnt and Depend to Auto.
Technology Tip: The TI-82 does not require multiplication to be expressed between variables, so means
It is often easier to press two or three ’s together than to search for the square key or the powers key. Of
course, expressed multiplication is also not required between a constant and variable. So, to enter
in the TI-82, you might save keystrokes and press just these keys: 2 X,T, X,T,
X,T,+ 3X,T, X,T, 4X,T, + 5.
2x
3
3x
2
4x 5
xx
3
.
xxx
x 1,
x 1,
Y
1
x
Y
1
1865),Y
1
x
1975 .10x,
Y
1
2230
x.
Y
1
Y
1
Y
1
x
I-6
Copyright © by Houghton Mifflin Company. All rights reserved. TI-82 Graphics Calculator
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