## Reference Topics 16-4

This is an interactive site discussing matrix operations:
http://www.mathportal.org/calculators/matrices-calculators/matrix-operations-calculator.php

This is an interactive site finding inverse matrices:
http://www.mathportal.org/calculators/matrices-calculators/matrix-calculator.php

This is a nice matrix operation site which also includes Gauss-Jordan elimination:
http://matrix.reshish.com/inverse.phpSee the whole entry

## Homework Hints 16-3

### Note: Homework Hints are given only for the Level 1 and Level 2 problems.

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 … See the whole entry

## 16.3 Outline

1. Definition of a matrix
1. subscripts
2. double subscripts
3. array
4. matrix
5. rows and columns
6. square matrix
7. order/dimension
2. Matrix form of a system of equations
1. augmented matrix
2. diagonal form
3. Elementary row operations and pivoting
1. elementary row operations
2. equivalent matrices
3. elementary row
See the whole entry