Calculator User Manual

Chapter 10: Matrices 222
Defining a Matrix
Defining a MatrixDefining a Matrix
Defining a Matrix
What Is a Matrix?
What Is a Matrix?What Is 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. The TI-84 Plus has 10 matrix variables,
[A] through [J]. You can define a matrix
directly in an expression. A matrix, depending on available memory, may have up to 99
rows or columns. You can store only real numbers in TI-84 Plus matrices.
4. Press
2 Í 3 Í 3 Í to complete the first
row for X + 2Y + 3Z = 3.
5. Press
2 Í 3 Í 4 Í 3 Í to enter the
second row for 2X + 3Y + 4Z = 3.
6. Press y5 to return to the home screen. If
necessary, press ‘ to clear the home screen.
Press y~ to display the
MATRX MATH
menu. Press } to wrap to the end of the menu.
Select
B:rref( to copy rref( to the home screen.
7. Press y
1 to select 1: [A] from the
MATRX NAMES menu. Press ¤Í. The
reduced row-echelon form of the matrix is
displayed and stored in
Ans.
1X N 1Z = L3 therefore X = L3+Z
1Y + 2Z = 3 therefore Y = 3 N 2Z