# 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 problems, check some sources for help on the internet (see the LINKS for that particular section. As a last resort, you can call the author at (707) 829-0606.

On the other hand, the problems designated “Problem Solving” generally require techniques that do not have textbook examples.

There are many sources for homework help on the internet.

Algebra.help
Here is a site where technology meets mathematics. You can search a particular topic or choose lessons, calculators, worksheets for extra practice or other resources.
http://www.algebrahelp.com/

Dr. Math is a registered trademark. This is an excellent site at which you can search to see if your question has been previously asked, or you can send your question directly to Dr. Math to receive an answer.
http://mathforum.org/dr.math/

Quick Math
This site provides online graphing calculators. This is especially useful if you do not have your own calculator.
http://www.quickmath.com/

The Math Forum @ Drexel
This site provides an internet mathematics library that can help if you need extra help. For additional homework help at this site, click one of the links in the right-hand column.
http://mathforum.org/

Problems 1-3
There questions are basically definitions and procedures. Read the book and then paraphrase each in your own words.
Problems 4-13
These problems are designed to test your understanding the terminology associated with matrices.
Problem 14
Arrange the coefficients in order before writing them in matrix form. See Example 1.
Problem 15
Choose the appropriate variables as shown in Example 2.
Problem 16-17
Use RowSwap.
Problem 18-19
Use *Row.
Problem 20-23
Use *Row+.
Problem 24-25
Use *Row.
Problem 26-27
Use *Row+.
Problem 28-31
Use *Row+.
Problem 32-35
Use *Row.
Problem 36-39
Use *Row+.
Problem 40-47
Write each system in matrix form and then apply the Gauss-Jordan method. If you have a calculator available, then you can use the matrix commands available to you. See Example 3.[/tipppy]

Problem 48-57
Write each system in matrix form and then apply the Gauss-Jordan method. If you have a calculator available, then you can use the matrix commands available to you. See Example 4.