Defining A Matrix - Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book

Í Í
4. Press
2 3
row for X + 2Y + 3Z = 3.
Í Í
5. Press
2 3
second row for 2X + 3Y + 4Z = 3.
6. Press y 5 to return to the home screen. If
necessary, press ' to clear the home screen.
Press y  ~ to display the
menu. Press } to wrap to the end of the menu.
Select to copy
B:rref(
7. Press y 
1
menu. Press ¤ Í. The
MATRX NAMES
reduced row-echelon form of the matrix is
displayed and stored in
1X N 1Z = L3 therefore
1Y + 2Z = 3 therefore

Defining a Matrix

What Is a Matrix?
A matrix is a two-dimensional array. You can display, define, or edit a matrix in the matrix editor.
You can also define a matrix using the MTRX shortcut menu (t `).The TI-84 Plus has 10
matrix variables, through
[A]
depending on available memory, may have up to 99 rows or columns. You can store only real
numbers in TI-84 Plus matrices. Fractions are stored as real numbers and can be used in
matrices.
Selecting a Matrix
Before you can define or display a matrix in the editor, you first must select the matrix name. To do
so, follow these steps.
1. Press y  | to display the
defined matrices are displayed.
2. Select the matrix you want to define. The
Í to complete the first
3
Í Í to enter the
4 3
MATRX MATH
to the home screen.
rref(
to select from the
1: [A]
.
Ans
X = L3 + Z
Y = 3 N 2Z
. You can define a matrix directly in an expression. A matrix,
[J]
MATRX EDIT
menu. The dimensions of any previously
screen is displayed.
MATRX EDIT
Chapter 10: Matrices 145