Evaluate Y - Texas Instruments TI-82 Keystroke Manual

(Do not use choice A, ref(, which is similar in appearance.) Select choice B by highlighting it
and pressing ENTER (or by pressing ALPHA B). The rref( command should now appear on the
Home screen. You need to tell the calculator which matrix to act upon with this command, so
press MATRX and press 1 or ENTER to select the
the matrix letter so that the Home screen displays rref([A]). Press ENTER to execute the
command. The calculator should display the reduced row echelon form of the matrix as shown
below.
This matrix indicates a system of equations equivalent to the original system and of the form
Thus, the solution of the system is
page 338

29 Evaluate Y

The TI-83 interprets function notation. Just as for a function
function when x = −1 can be denoted
denoted Y (−1). In the Y= screen enter as Y
1
return to the Home screen. Press VARS and use the arrow keys to highlight the Y-VARS menu
heading at the top of the screen. In the Y-VARS menu press ENTER to choose the Function... menu.
from this menu by pressing ENTER. The calculator returns to the Home screen, and the
Choose Y
1
will be displayed on the screen. Now type the number −1 in parentheses so that the
variable Y
1
(-1)is displayed on screen. Press ENTER to see 5, the value of Y
expression Y
1
To find the value of Y
cursor over the -, type a 3, and then press DEL so that the expression reads Y
to get the value 33. See also 21 Evaluate Y and 22 Table.
+ =
x 0 y 1
+ = −
0 x y 1
=
=
x 1 , y
R (− ) 1 , with the TI-83 the value of Y
1
when x = 3, press 2nd [ENTRY] to reproduce a copy of Y
1
2 ×
3 matrix A. Type a close parenthesis after
=
x 1
or
= −
y 1
1 −
, or in ordered pair form (1,−1).
=
R ( x ) 4
= −
2
the equation y 4 x
TI-83
−
2
x x the value of the
when x = −1 can be
1
. Then press 2nd [QUIT] to
x
when x is −1.
1
(-1), move the
1
(3). Press ENTER
1
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