1. 12-1 Organizing Data Using Matrices

2. Matrix: is a rectangular arrangement of numbers in rows and columns Size of Matrix: rows × columns Element: Each number in a matrix

3. Problem 1: Adding or Subtracting Matrices
Find the sum or difference: − −3 + −3 −3.9 −4 2

4. Find the sum or difference: 2 11 −4 3.2 1.5 −5 − −1 8 −6.5 4 0 −3

5. Scalar: the real-number you multiply a matrix by in order to solve problems Scalar Multiplication: When you multiple a matrix by a scalar When using scalar multiplication, multiply each element in the matrix by the scalar

6. Problem 2: Multiplying a Matrix by a Scalar
What is the product? 3 4 −1.5 1 −6

7. What is the Product? −2 −