1. Precalculus Section 14.1 Add and subtract matrices Often a set of data is arranged in a table form. 12015514089 13520585105 9516512592 A matrix is a rectangular array of numbers.

2. The order (dimensions) of a matrix is the number of rows by columns 3 X 4 2 X 3

3. Student examples Name the order(dimensions)of the matrices. 5 X 2 1 X 3

4. Two matrices can be added or subtracted only if they have the same order (dimensions).

5. Student examples Perform the indicated operations

6. Matrices can be multiplied by a number (scalar) Simplify 5 Student example -1/2

7. Two matrices are equal if they have the same dimensions and all their corresponding entries are equal. Solve for x,y, and z. =

8. Simplify using a calculator 5 + Find the transpose of the resulting matrix.

9. Assignment Page 520 problems 1-15, 17,18,19