2 functions and graphs – Texas Instruments TI-85 User Manual
Page 11
Chapter 1
B-11
Copyright © Houghton Mifflin Company. All rights reserved.
Evaluate
y
1
at x = 7 by recalling the previous entry with
2nd
ENTER
(
ENTRY
) , edit the 5 to 7 by pressing
and typing over the 5, and press
ENTER
.
Repeat the process to evaluate
y
1
at x = 10.
&
1.2 Functions and Graphs
When you are asked to estimate or approximate an output or an input value, you can use your
calculator in the following ways:
¥
tracing a graph
(Sections 1.1.5, 1.1.6)
¥
close values obtained from a table of function values
(End of Section 1.2.2)
When you are asked to find or determine an output or an input value, you should use your
calculator in the following ways:
¥
evaluating an output on the home screen
(Section 1.1.7)
¥
find a value using the
AUTO
or
ASK
features of the table
(Section 1.2.1)
¥
determine an input using the solver
(Section 1.2.2)
1.2.1 DETERMINING OUTPUTS
Function outputs can be determined by evaluating on t h e
home screen, as discussed in 1.1.7. You can also evaluate functions using the calculatorÕs
TABLE
. (On the TI-85, the table is accessed with program
TABLE
.) When you use the table,
you can ask for specific output values corresponding to the inputs you enter or generate a list
of input values that begin with
TblMin
and differ by
D
Tbl
and their corresponding outputs.
LetÕs use the
TABLE
to determine the output of the function v(t) = 3.622(1.093)
t
when t =85.
Press
GRAPH
F1
(
y(x)=
) , clear any functions, and enter 3.622(1 .093)^
X
in location
y
1
. Exit.
TI-85
Note that when using program
TABLE,
any
functions you want to evaluate should be in locations
y
1
,
y
2
, and so forth. That is, donÕt leave an empty
function location in the
y(x)=
list. (Program
TABLE
can be found in the TI-85/86 Appendix.)
An alphabetical list of the programs that you have
entered in your TI-85 appears on the bottom menu.
Press
PRGM
and then press
F1
(
NAMES
) .
Find the name
TABLE
(press
MORE
if necessary).
Press the
F
-key corresponding to the location of the
program and
ENTER
to ÒrunÓ the program.
Since we only want v(85), enter
2
for
ASK
and type
85
at the
x=?
prompt.