1. 8.2 Matrices
Objective: Perform basic operations with
matrices
Standard: Linear Algebra 4.0 and 5.0

2. What's a Matrix?

3. Matrix Addition
Ex. 1)

4. Ex. 2)

5. Scalar Multiplication

6. Ex. 3)

7. Ex. 4)

8. Matrix Multiplication
The sum of the products of rows and
columns

9. Note: The columns in the first matrix
must match the rows in the second
matrix.
Example:

10. Ex. 5)

11. Order Matters!!

12. The Identity Matrix
Basically, 1s on the diagonal

13. Assignment:
#11 p. 597
#3, 6-8, 15, 23, 28-30,
41, 43