1. What is the dimension of the matrix below?
Warm-up
What is the dimension of the matrix below?

2. Adding, Subtracting, and Scalar Multiplication of Matrices

3. Only matrices with the same dimensions can be added and subtracted.
The resulting matrix has the same dimension of the two matrices being added or subtracted.

4. Examples
Add the corresponding elements in each matrix

5. We can’t add because they are different dimensions!!!

7. Scalar Multiplication:
each element in a matrix is multiplied by a constant.

8. Examples.

9. Closure:
[ ]+[ ]
10[ ]