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B-14
TI-85/TI-86 Graphing Calculators
Notice that you could have typed the v(t), with input
variable t, directly in the solver. The solution is, of
course, the same.
If there is more than one solution to an equation, you need to give the solver an approximate
location for each answer. Suppose you are given q(x) = 8x
what input(s) correspond to an output of q(x) = 154. (The procedure outlined below also
applies to finding where two functions are equal.)
2
Enter 8x
+ 54.65x Ð 163 in one location, say y
in another location, say y
(Remember that if the input variable in the equation
is not x, you must rewrite the equation in terms of x to
graph using the y(x)= list.)
To better obtain a guess as to where y
y
, graph the equations.
2
If you are not told where you want to view the graph,
begin by pressing
(
GRAPH
F3
ZOOM
You want to see a ÒgoodÓ graph, that is, one that shows
all the important features. In this case, the important
features are where y
Neither this graph nor the previous one is a good graph
for viewing the intersections.
To improve the view, use
change to xMin =
yMax = 400 . Draw the graph with
(There are many other windows that work just as well
as the one shown to the right. Also, instead of setting
a window manually, you could draw the graph with
in the
ZFIT
ZOOM
*The current settings for the graphics screen are obtained with
TI-85 and with
RANGE is at the top of the TI-85 screen and the word WINDOW is at the top of the TI-86
screen. Because the only difference in the calculators in this situation is the name that is
used, we from this point forward refer to this key for both calculators as
(
or
F2
RANGE
from the TI-85.
, in the y(x)= list.
2
1
(
)
GRAPH
F3
ZOOM
)
(
MORE
F4
ZDECM
and y
intersect.
1
2
(
EXIT
F2
RANGE
–
15, xMax = 8, yMin =
F3
menu
.)
(
) on the TI-86. When the screen appears, the word
GRAPH
F2
WIND
) . In such cases, the screen shown in the right column will be the one
WIND
2
+ 54.65x Ð 163 and asked to find
, and 154
1
equals (intersects)
(
) or
F4
ZSTD
) .
or
) * and
WIND
–
300, and
(
) .
GRAPH
Copyright © Houghton Mifflin Company. All rights reserved.
(
) on the
GRAPH
F2
RANGE
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