Texas Instruments TI-83 - 11.4 Systems of Linear Equations: Determinants; Example 2 Using a Graphing Utility to Evaluate a 2 by 2 Determinant; Example 3 Solving a System of Linear Equations Using Determinants

We enter the matrix A. If you don't remember how to enter a matrix, see Section 11.3 of
this TI-83 manual. You should have the following in A:
Select MATRX, scroll right to highlight MATH. Now select 1:det(. You should
have the following on your home screen:
Select matrix A by press MATRX and selecting 1:[A] from the NAMES menu. Close
your parenthesis and hit ENTER to obtain the result.
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EXAMPLE 3 Solving a System of Linear Equations Using Determinants
Use Cramer's Rule, if applicable, to solve the system
324
613
xy
xy
−=


+=

Graphing Solution
Enter all three matrices as defined in the text. For example,