﻿ Math 220 Week 3
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##### Math 220 Menu

Note that a graphing calculator is
NOT required but is especially helpful
in this class. I will be using a
TI-84 C (color) in my mini-movies.
Click the heading to the left titled
USING A GRAPHING CALCULATOR
for alternatives to purchasing a TI-84.

Join my site for full access
to all resources for Math 220.
One time payment of \$9.95.

To my students: You will be given

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## Math 220 Wk 3 - Systems of Equations & Matrices

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#### STRUGGLING?    HERE ARE FOUR TIPS

[+]  MML STUDY PLAN

#### MINI-MOVIES (11 MASTERY POINTS)CC

##### 5.1 Systems of Linear Equations in Two Variables
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Solve linear systems in two variables by substitution.

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Solve linear systems in two variables by addition.

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Solve linear systems in two variables by the method of your choice.

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Solve applications

##### 5.4 Systems of Nonlinear Equations in Two Variables
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Solve nonlinear systems in two variables by substitution.

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Solve nonlinear systems in two variables by addition

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Solve nonlinear systems by method of your choice

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Solve problems using nonlinear systems

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Solve applications

##### 5.5 Systems of Inequalities
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Graph systems of inequalities.

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Solve applications

##### 6.1 Matrix Solutions to Linear Systems
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Use matrices and Gaussian elimination to solve systems.

##### 6.3 Matrix Operations and Their Applications
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Perform matrix operations.

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Solve applications

[+]  MML CHECKPOINT

#### MINI-MOVIES (10 QUESTIONS)CC

1. Solve linear systems using substitution (5.1.7) 2 min 44 sec   Transcript
2. Solve linear systems by addition (5.1.23) 1 min 28 sec   Transcript
3. Solve linear systems by method of your choice (5.1.35) 2 min 5 sec   Transcript
4. Solve applications (5.1.55) 1 min 27 sec   Transcript
5. Solve nonlinear systems by substitution (5.4.3) 2 min 27 sec   Transcript
6. Solve nonlinear systems by method of your choice (5.4.29) 3 min 47 sec   Transcript

INSTRUCTOR TIP FROM JOLENE: Order of your solutions does not matter; however, MML will mark the answer wrong if you forget commas.

7. Use matrices & Gaussian elimination to solve systems (6.1.25) 1 min 22 sec   Transcript
8. Use matrices & Gaussian elimination to solve systems (6.1.57) 2 min 25 sec   Transcript
9. Perform matrix operations (6.3.11) 19 sec   Transcript
10. Perform matrix operations (6.3.29) 14 sec   Transcript

INSTRUCTOR TIP FROM JOLENE: Careful when entering your answer. Use the matrix template on the toolbar at the bottom of the screen to get the matrix square brackets. Do not type the square brackets from the keyboard. MML will mark your answer wrong if you type [ ] instead of using the matrix template.

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#### ACCESSIBILITY

I am in the process of adding closed captions to all my mini-movies, but since I have several thousand mini-movies on my site, this will take quite some time. All pdf documents are available in their original Word format for those who need to read the math equations with a screen reader. As I learn how to make my site more accessible, I will add these features. If you are a member of my site and need accessibility, please contact me via e-mail at jolene@jolenemorris.com and we'll work out something until my site is fully accessible.

As I create new mini-movies, I have been including the closed captions and transcripts. But each day I go back and add closed captions and transcripts to at least one mini-movie. To understand the scope of this problem, I have over 5,000 mini-movies on my website. If I do only one mini-movie per day, this conversion will take over 13.5 years!! As such, I am working on highest priority mini-movies first, and I am looking for alternate ways to add captions and transcripts to existing mini-movies.

Closed captions are word-for-word translations of the mini-movie, while transcripts are "descriptive" transcripts to reflect not only the voice but the visual component of the video. Coming soon: A web page with non-graphical links to all descriptive transcripts for each course.

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#### What Are the Mini-movies?

What are the mini-movies? The mini-movies are marked with a icon. They are MP4 video files that contain a teaching presentation with an audio track. These were recorded in my office (not in a live lecture) so they are short, but very dense with compact information. Movie controls are available so you can replay, pause, and skip sections.

At times, a mini-movie may stop abruptly in the middle of play or it might not load at all. The website bandwidth that I pay for only allows 3-4 movies downloaded at a time. So if your mini-movie stops in the middle or won't download properly, refresh/reload your browser window and it should work.

Maintained according to Earthlink Publishing Guidelines by Jolene M. Morris