Consider the following system of linear equations:
4x1 + 3x2 = 7 x1 + x2 = -1
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):
4
3
7
1
1
-1
5. When you are done, press
.
1. Press
2. Select the Math option.
3. Select 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, it should be apparent that x1 = 10 and x2 = -11.