Enter the System as a Matrix
1. To enter a matrix, begin by entering this keystroke combination:  
2. Use the cursor keys to select the Edit option and then select row 1 (matrix A). Press  .
3. Enter the dimensions of the coefficient matrix (2 rows by 3 columns):
2 3
4. Enter the values of the coefficient matrix (row by row):
8 7 720 4 6 500
5. When you are done, press  .
Display the Reduced Row Echelon Form (rref) of the Matrix
1. Press
2. Select the Math option.
3. Scroll down to the rref( option and press . The screen display will look like this:
4. Press and with matrix A selected and close the parentheses. The screen display will look like this:
5. Press a second time and the reduced row echelon form of the augmented matrix will be displayed:
In this form, we see that x1 = 41 and x2 = 56.
Example 2:
 →  → x = 66, y = 36
Example 3:
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