HP F2226A - 48GII Graphic Calculator User Manual page 344

Graphing calculator
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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):
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