1. Find the area of the Triangle
(5, 9)
Use a Determinant
(9, 5) 1 2 5 9
(1, 2)

2. YOU TRY!!! Find the area of the triangle.=
Square units

3. Solving a Matrix Equation
X = A-1B

4. Solving Systems Using Inverse Matrices

5. Setting Up the Matrices
Matrix A will be the coefficients of the system
Matrix X will be the variables
Matrix B will be constants (what the system of equations are equal to)

6. Example 1: Use matrices to solve the linear system
Type in [A]-1 [B]
Find the inverse
(-1, 4)

7. Example 4: Use matrices to solve the linear system
Type in [A]-1 [B]
(2, 3, -2)

8. ODDS on the back of the worksheet!
Practice
ODDS on the back of the worksheet!
10 minutes!

9. Let’s apply this…
You have $18 to spend for lunch during a 5 day school week. It costs you $1.50 to make lunch at home and $5 to buy lunch. How many times each week do you make a lunch at home?
Type in [A]-1 [B]
(2, 3)
You make lunch at home 2 times a week.