### Chapter 5, “Matrix Operations”

#### Equal Matrices

Two matrices are equal if

#### Adding Matrices

For two matrices of the same size, add the corresponding entries.

#### Subtracting Matrices

For two matrices of the same size, subtract the corresponding entries.

#### Scalar Multiplication

for any scalar value c and any size matrix A.

#### Multiplying Two 2×2 Matrices

#### Is the Product Defined?

For matrix multiplication AB, the number of columns in A must equal the number of rows in B.

#### Size of the Product ...