Drawi Ng A Graph - Texas Instruments TI-89 Manual

TI-89 Guide

1.1.2 DRAWI NG A GRAPH

the problem description indicates the valid input interval. Consider Example 4 of Section 1.1:
The value of a piece of property between 1980 and 2000 is given by v(t) = 3.622(1.093
thousand dollars where t is the number of years since the end of 1980.
The input interval is 1980 (t = 0) to 2000 (t = 20). Before drawing the graph of v on this inter-
val, have the function v entered in the
this Guide.) We now draw the graph of v for x between 0 and 20.
Press
F2 (WINDOW)
for and 20 for
xmin
enter 2 for
xscl.
does not affect the shape of the graph. Ignore the other
xscl
numbers − we set their values in the next set of instructions.)
The numbers
xmin
viewing screen, and
of the viewing screen.
(Leave set to the default value of 2 for all applications in this Guide.)
xres
To have the TI-89 determine the view for
the output, press
or use
(A) [ZoomFit]
and press
ZoomFit
Note that any vertical line drawn on this graph intersects it in only one point, so the graph does
represent a function.
Press
F2 (WINDOW)
The view has 0
(Note that
ZoomFit
manually.)
Let's now explore how to graph with the function defined on the home screen as v(t).
Press
HOME
be sure you are using the correct func-
tion. Press
in the location. Press
y 2
to turn off
[ ]
b
Draw the graph of
If you need to edit a function, press
from the graphing list. Press
WARNI NG: You must use x as the input variable when in the
letter inside the parentheses following
Copyright © Houghton Mifflin Company. All rights reserved.
As is the case with most applied problems in Calculus Concepts,
Y=
to set the view for the graph. Enter 0
(For 10 tick marks between 0 and 20,
xmax.
If you want 20 tick marks, enter 1 for
and are, respectively, the settings for the left and right edges of the
xmax
and are, respectively, the settings for the lower and upper edges
ymin ymax
and set the spacing between the tick marks on the x- and y-axes.
xscl yscl
F2 [Zoom] alpha =
to highlight
▼
ENTER .
to see the view set by
x 20 and 3.622 y
≤ ≤ ≤
did not change the x-values that you set
and type to
ENTER
v ( t )
and enter
F1 (Y )
=
v ( x )
and
▲ F4
.
y 1
= using exactly the same procedure as that for drawing the graph of
v y 2
ENTER
to deactivate
F4 [ ]
b
, you will likely get an "undefined variable" message.
v
list using x as the input variable. (See Section 1.1.1 of
etc.;
xscl,
ZoomFit.
21.446... .
≤
or to move the cursor to the entry line
F3 [Edit]
after you draw its graph.
y 2
Y
TI 89-7
list. If you use t or another
=
t
)
.
y 1