Casio fx-991EX Quick Start Manual page 15

MATRIX
Redefine the matricies by pressing i1
(Define Matrix).
Press 1(MatA) to define Matrix A and enter the
3 x 3 coefficient matrix.
Select the number of rows, 3(Rows).
Select the number of columns, 3(Columns).
Enter the values of the coefficients, pressing p after
each one to move to the next value.
Now, enter the 3 x 1 solution matrix as Matrix B.
Press i1(Define Matrix).
Define Matrix B 2(MatB) as a 3 x 1, so select 3(Rows)
and 1(Columns) from the next two windows.
fx-991EX Quick Start Guide 15