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474 Matrices
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
2. Create the vector of
the three constants in
the linear system.
5
E7E1
E