# Math Video: Linear Graphs & Equations

## By Wei Chong

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#### Description

This math video app provides a quick and simple way for you to learn and understand the basics behind linear graphs and equations. All of the 12 computer animated videos are stored in your device. So, no internet connection required to play. These math videos are: The coordinate plane, the coordinates of a point, graphing linear equations, the ’change in x’ & ‘change in y’, slope of a line, slope formula, positive slope & negative slope, the x-intercept & y-intercept, the slope-intercept form, slope-intercept form examples, determining the equation of a line, equation of lines parallel to the axes. Each of these videos is divided into several different parts that you can easily skipped to. More details below:

1. The coordinate plane

•Introduction

•The x-axis or horizontal axis

•The y-axis or vertical axis

•The point of origin

•The four quadrants

2. The coordinates of a point

•Introduction

•Position of a point

•Read and write the x-coordinate and y-coordinate

•Example 1 & example 2

•Example 3 & example 4

3. Graphing linear equations

•Introduction

•Graphing the equation y=2x+1

•Finding the y-coordinate of the first point when its x-coordinate is 1

•Plotting the first point

•Calculating and plotting the rest of the points

4. The ’change in x’ & ‘change in y’

•Introduction

•The basics: First 'run' and then 'climb'

•Example 1: Calculating the 'change in x'

•Example 1: Calculating the 'change in y'

•Example 2: Calculating the 'change in x' & 'change in y’

5. Slope of a line

•Introduction

•Drawing & visually examining the slope of a line

•Assigning a meaningful number to the slope

•How are 'change in x' and 'change in y' useful

•Exploring the slope of a line

6. Slope formula

•Introduction

•Slope is the ratio of 'change in y' to 'change in x'

•Deriving the slope formula

•An example on using the slope formula

•Another example on using the slope formula

7. Positive slope & negative slope

•Introduction

•Zero slope

•Positive slope

•Infinite slope

•Negative slope & more examples

8. The x-intercept & y-intercept

•Introduction

•Visual demonstration on the y-intercept

•Visual demonstration on the x-intercept

•Example 1: The x-intercept & y-intercept of y=2x+4

•Example 2: The x-intercept & y-intercept of 2x-4y=8

9. The slope-intercept form

•Introduction: What is the slope-intercept form?

•Demo on the slope-intercept form a line

•Visual demo on the y-intercept (b)

•Visual demo on the slope (m) when it is positive

•Visual demo on the slope (m) when it is zero or negative

10. Slope-intercept form examples

•Introduction

•Example 1: Draw the line of y=-2x+3

•Example 1: Draw the line after analyzing m & b

•Example 2: Draw the line of 3y-2x=-6

•Example 2: Draw the line after analyzing m & b

11. Determining the equation of a line

•Introduction

•Example 1: Determine the equation when a point and slope are given

•Example 2: Determine the equation when two points are given

•Example 2: Use the two points to find the slope (m)

•Example 2: Use one of the points to find the y-intercept (b)

12. Equation of lines parallel to the axes

•Introduction

•Understanding equation of the line parallel to the x-axis

•Understanding equation of the line parallel to the y-axis

•Example 1: The equation of a line that is parallel to the x-axis

•Example 2: The equation of a line that is parallel to the y-axis

#### What's New in Version 1.1

Updated the app to support iPhone 5's new screen size.

Fixed the issue where the video screen is not displayed properly for iPad with iOS 6.

- USD 1.99
- Category: Education
- Updated: 27 November 2012
- Version: 1.1
- Size: 55.2 MB
- Language: English
- Developer: Ng Wei Chong
- © Ng Wei Chong

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.