1. Matrices on the Graphing Calculator I.. Entering a Matrix into the calculator. 1) Press MATRIX (2 nd Matrix) 2) Go  to EDIT (use scroll arrows) 3) Chose the desired matrix letter & press ENTER. 4) Use the scroll arrows to move the cursor. Enter in the order / size of the matrix. 5) Type in the entries. Press enter after each one. 6) Press 2 nd QUIT to exit the matrix screen.

2. Matrices on the Graphing Calculator II.. Adding, Subtracting, Scalars, and Multiplication. 1) Press MATRIX (2 nd Matrix). 2) Chose the desired matrix letter & press ENTER. 3) Chose the math operation you want to do to it. 4) Press MATRIX (2 nd Matrix). 5) Chose the desired matrix letter & press ENTER. 6) Press ENTER to perform the math.

3. Matrices on the Graphing Calculator III.. Using rref to Solve Systems of Equations. A) Put the system into augmented matrix form. 1) Enter in the augmented matrix. (2x3) or (3x4) 2) Press 2 nd QUIT to exit the matrix screen. 3) Press MATRIX (2 nd Matrix) 4) Go  to Math and go down to “rref”. ENTER. 5) Press MATRIX & chose desired matrix. 6) Press ENTER to perform the math.