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Chapter 2: Operating the Calculator 21
02OPER DOC TI
-
89/TI
-
92 Plus: O
p
erating the TI
-
89/TI
-
92 Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 21 of 44
The letters x, y, z, and t are commonly used in algebraic expressions.
So that you can type them quickly, these letters are primary keys on
the
TI
-
89
keyboard.
X Y Z T
Other letters are available as the
j
function of another key,
similar to the
2
and
¥
modifiers described in the previous section.
For example:
´
A
=
To: On the TI
.
89, press: On the TI
.
92 Plus, press:
Type a single
lowercase
alpha
character.
j
and then the letter
key
(status line shows
)
the letter key
Type a single
uppercase
alpha
character.
¤
and then the letter key
(status line shows
+
)
¤
and then the letter key
(status line shows
+
)
Type a space.
j
(alpha function
of the
·
key)
spacebar
Turn on
lowercase
alpha-lock.
2
™
(status line shows
)
(no action needed)
Turn on
uppercase
ALPHA-lock.
¤
™
(status line shows
)
2 ¢
Turn off alpha-
lock.
j
(turns off upper-
and lowercase lock)
2 ¢ (turns off
uppercase lock)
Entering Alphabetic Characters
Alphabetic characters are used in expressions such as x
ñ
+y
ñ
,
to enter variable names (page 47), and in the Text Editor
(Chapter 18).
Entering a Letter
Character on the
TI-89
Typing Alphabetic
Characters on the
TI-89 / TI-92 Plus
Note: On the
TI
-
89
, you do
not need
j
or alpha-lock
to type x, y, z, or t. But you
must use
¤
or uppercase
ALPHA
-lock for X, Y, Z, or T.
Note: On the
TI
-
89
, alpha-
lock is always turned off
when you change
applications, such as going
from the Text Editor to the
Home screen.
j
[A] types an A,
which is the same
color as the
j
key.
2
È
types
´
, which
is the same color as
the
2
key.