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.
