HP 39g+ - Manual (Page 186)

13-8 Matrices
To divide the two matrices M1 and M2 that you created
for the previous example, press the following keys:
M1
M2
To invert a matrix You can invert a square matrix in HOME by typing the
matrix (or its variable name) and pressing
x –1
. Or you can use the matrix INVERSE command.
Enter INVERSE(matrixname) in HOME and press
.
To negate each
element You can change the sign of each element in a matrix by
pressing
before the matrix name.
Solving systems of linear equations
Example Solve the following linear system:
1. Open the Matrix
catalog and create a
vector.
MATRIX
2. Create the vector of the
constants in the linear
system.
5 7
1
3. Return to the Matrix
Catalog.
MATRIX
In this example, the
vector you created is
listed as M1.
2x 3y 4z + + 5
x y z – + 7
4x y – 2z + 1
=
=
=