Find the area of the Triangle

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Presentation transcript:

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

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

Solving a Matrix Equation X = A-1B

Solving Systems Using Inverse Matrices

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)

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

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

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

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.