Chapter 4: Matrices Lesson 1: using Matrices to Represent Data  Objectives: –Represent mathematical and real-world data in a matrix. –Find sums and differences of matrices and the scalar product of a number and a matrix.

MATRIX: A rectangular arrangement of numbers in rows and columns. The ORDER of a matrix is the number of the rows and columns. The ENTRIES are the numbers in the matrix. rows columns This order of this matrix is a 2 x 3.

3 x 3 3 x 5 2 x 2 4 x 1 1 x 4 (or square matrix) (Also called a row matrix) (or square matrix) (Also called a column matrix)

To add two matrices, they must have the same order. To add, you simply add corresponding entries.

= =

To subtract two matrices, they must have the same order. You simply subtract corresponding entries.

= (-1) (-4) =

In matrix algebra, a real number is often called a SCALAR. To multiply a matrix by a scalar, you multiply each entry in the matrix by that scalar.

(-3) -5 -2(6)-2(-5) -2(3)

Assignment 1 Ch.4.1 pg.221 # 6 to 9, 12 to 14, and 19 to 23. Ch.4.1 pg.221 # 6 to 9, 12 to 14, and 19 to 23. Due date: Sept. 30 th, 2009Due date: Sept. 30 th, 2009 To: Mr. Mohammed AkourTo: Mr. Mohammed Akour By

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