Texas Instruments TI-83 - Page 56

Now press the close parenthesis ) - this is a 2
nd
function above the number 9. We want
our matrix in fractional form, so press MATH and select 1:äFrac. Now press ENTER
to obtain the result shown in Figure 7(b).
You can scroll right using the arrow key to see the rest of the matrix.
If you want your matrix in reduced row echelon form, press MATRX, then highlight the
MATH menu and scroll down until you select B:rref(. Hit ENTER and now press
MATRX, and select matrix
A. Close the parenthesis and
select the FRAC option. Hit
ENTER to obtain the
following:
w
11.4 Systems of Linear Equations: Determinants
EXAMPLE 2 Using a Graphing Utility to Evaluate a 2 by 2 Determinant
Use a graphing utility to evaluate
32
61
−
.
SOLUTION