Algebra 1 Online! Henrico County Public Schools, Virginia
Module - Linear Equations
Lesson 1 - Slope
 Lessons 1- Slope 2- Point-Slope and Standard Form 3- X- and Y-intercepts 4- Slope-Intercept Form 5- Graphing Linear Equations 6- Graphing Linear Inequalities 7- Module Review
SOL

A.6a -The student will graph linear equations and linear inequalities in two variables, including determining the slope of a line when given an equation of the line, the graph of the line, or two points on the line. Slope will be described as rate of change and will be positive, negative, zero, or undefined.

## Concept of Slope

The following construction shows a line that runs through the origin of the coordinate system and a moveable point M.

On the left, you can also see the corresponding linear equation.

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## Practice with Slope

To move the red line you may click on and move Points A and B. Stop each point at an intersection point on the grid. Slope is the ratio of the vertical change to the horizontal change between two points.

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## Finding Slope Given 2 Points

To move the red line click on point A or B and use the up and down arrow keys.

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Common Core Standards
 8.EE.5 8.EE.6 8.F.3 8.F.4 8.SP.3 A-CED.2 A-REI.10 A-REI.12 F-IF.6 F-BF.3 F-LE.2 S-ID.7
Warm-up
Lessons
Videos
Explore Learning
1. Slope - Activity B: Explore the slope of a line, and learn how to calculate slope. Adjust the line by moving points that are on the line, and see how its slope changes.
Geogebra

Internet Sites
1. Notes: Using Slope to Graph Lines - notes on graphing using slope at Purplemath.com
2. Notes: Slope of Lines - notes on finding slope at Purplemath.com
3. Interactive: Geoboard - Interactive math manipulative at matti.usu.edu that uses a virtual geoboard to find the slope between two points. Select Geoboard from the list.
4. Interactive: Slope Activity - adjust the line on a graph to identify the correct slope.