Transcription of CHAPTER 8: MATRICES and DETERMINANTS
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CHAPTER 8: MATRICES and DETERMINANTS
(Section : MATRICES and DETERMINANTS ) CHAPTER 8: MATRICES and DETERMINANTS . The material in this CHAPTER will be covered in your Linear Algebra class (Math 254 at Mesa). SECTION : MATRICES and SYSTEMS OF EQUATIONS. PART A: MATRICES . A matrix is basically an organized box (or array ) of numbers (or other expressions). In this CHAPTER , we will typically assume that our MATRICES contain only numbers. Example Here is a matrix of size 2 3 ( 2 by 3 ), because it has 2 rows and 3 columns: 1 0 2 .. 0 1 5 . The matrix consists of 6 entries or elements. In general, an m n matrix has m rows and n columns and has mn entries. Example Here is a matrix of size 2 2 (an order 2 square matrix): 4 1 .. 3 2.
11 1 4 Here, we switch rows R 1 and R 2, which we denote by: R 1 R 2 After: 1 new R new R 2 11 3 1 4 1 In general, we can reorder the rows of an augmented matrix in any order. Warning: Do not reorder columns; in the coefficient matrix, that will change …
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