User Manual

Chapter 10: Matrices 144
Getting Started: Systems of Linear Equations
Getting Started is a fast-paced introduction. Read the chapter for details.
Find the solution of X + 2Y + 3Z = 3 and 2X + 3Y + 4Z = 3. On the TI-84 Plus, you can solve a
system of linear equations by entering the coefficients as elements in a matrix, and then using
rref(
to obtain the reduced row-echelon form.
6. Press Í to store the matrix to
[C].
In the matrix editor (y Q), you can see that
matrix
[C] has dimension 2x2.
You can press ~ ~ to display the
EDIT screen and
then select
[C] to edit it.
1. Press y . Press ~ ~ to display the
MATRX EDIT menu. Press 1 to select 1: [A].
2. Press
2 Í 4 Í to define a 2×4 matrix. The
rectangular cursor indicates the current element.
Ellipses (
...) indicate additional columns beyond
the screen.
3. Press
1 Í to enter the first element. The
rectangular cursor moves to the second column of
the first row.