HP 49g+ - Manual (Page 340)

Page 11-18
To enter matrix A you can activate the Matrix Writer while the A: field is
selected. The following screen shows the Matrix Writer used for entering
matrix
A, as well as the input form for the numerical solver after entering
matrix A (press ` in the Matrix Writer):
Press
˜ to select the B: field. The vector b can be entered as a row vector
with a single set of brackets, i.e., [13,-13,-6] @@@OK@@@ .
After entering matrix A and vector b, and with the X: field highlighted, we can
press
@SOLVE! to attempt a solution to this system of equations:
A solution was found as shown next.
To see the solution in the stack press
`. The solution is x = [1,2,-1].
To check that the solution is correct, enter the matrix A and multiply times this
solution vector (example in algebraic mode):