Texas Instruments TI-84 Plus Manual page 68

With the cursor in
( X,T,θ,n 2ND
1 [Function] 2 [Y2] ) ( X,T,θ,n 2ND
) .
Your calculator draws graphs by connecting function outputs wherever the function is defined.
However, this function breaks at x = 20. The calculator will connect the two pieces of r unless
you tell it not to do so. Whenever you draw graphs of piecewise functions, set your calculator
to mode as described below so that it will not connect the function pieces at the break point.
Dot
Turn off and
Y1
press until the blinking cursor is on the slanted line
◄
left of . Press
Y3
slanted line change shapes until it becomes a dotted slanted line
(as shown to the right). Press
cursor to the right of the equals sign.
NOTE: The method described above places individual functions in
return to standard
put all functions in
. However, if you choose to set
ENTER
screen, select
MODE
Now, set the window. Set the
Xmax = 30. Use
If the picture is not very good, you will probably want to manually reset the height of the
window as described below.
We set the lower and upper endpoints of the input interval as
and
Xmin Xmax
Xmax = 30, Ymin = -1,
(The visible breaks in the left piece of the graph occur because
we are graphing in dot mode, not connected mode.)
You can find function values by evaluating outputs on the
home screen or using the table. Either evaluate
look at the inequalities in the function P to determine whether
or should be evaluated to obtain each particular output.
Y1 Y2
68
, press
Y3 ( VARS ► 1 [Function] 1 [Y1] )
MATH [TEST] 6 [<] 20 )
. Place the cursor on the first line of
Y2
6 times. You should see the solid
ENTER
several times to return the
►
mode when the function locations are cleared. If you want to
(Connected)
mode at the same time, press
Dot
, and press
Connected
WINDOW
(ZoomFit) to show the graph.
ZOOM 0
, respectively. Press
WINDOW ,
and Press
Ymax = 1.
+ ( VARS ►
MATH [TEST] 3 [>] 20
and
Y3
1
to the
MODE ▼ ▼ ▼ ▼ ► [Dot]
mode in this manner, you must return to the
Dot
to take the calculator out of
ENTER
with Xmin = 0 and
set
Xmin = 0,
GRAPH .
or carefully
Y3
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Chapter 5
mode. The functions
Dot
mode.
Dot