HP Prime Graphing Calculator - Manual (Page 478)

472 Matrices
This operation is not a mathematical division: it is a left-
multiplication by the inverse of the divisor. M1/M2 is
equivalent to M2
–1 * M1.
To divide the two
matrices you created for
the previous example,
press the following keys:
A Q 1 n
A Q 2
To invert a matrix You can invert a square matrix in Home view by typing the
matrix (or its variable name) and pressing
SnE . You can also use the INVERSE
command in the Matrix category of the Math menu.
To negate each
element
You can change the sign of each element in a matrix by
pressing
Q , entering the matrix name, and pressing
E .
Solving systems of linear equations
You can use matrices to solve systems of linear equations,
such as the following:
2x+3y+4z=5
x+y–z=7
4x–y+2z=1
In this example we will use matrices M1 and M2, but you
could use any available matrix variable name.
1. Open the Matrix
Catalog, clear M1,
choose to create a
vector, and open the
Matrix Editor:
St
[press = or \ to
select M1]
C E