Unit Plan
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Standard Form of a Line

For Students 9th - 10th Standards
Dr. Math gives an inspiring and clear discussion about equations of lines and lines as functions. The Dr. discusses the benefits of the standard form of a line and prompts the student with an equation which can not be written in the...
Handout
CK-12 Foundation

Ck 12: Algebra: Determining the Equation of a Line

For Students 9th - 10th Standards
This comprehensive study guide highlights the main terms and formulas needed to determine the equation of a line. Examples are included.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Slope of a Line

For Students 7th - 9th Standards
Twenty-two problems present a practice finding the slope of a line. The solutions are only available with a paid subscription.
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Khan Academy

Khan Academy: Parallel and Perpendicular Lines From Graph

For Students 9th - 10th Standards
Given points that two lines go through or the graph of each line, classify the lines as parallel, perpendicular, or neither. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
Website
Cool Math

Coolmath: Perpendicular Lines

For Students 9th - 10th Standards
This CoolMath Resource will help students determine if lines are perpendicular by finding the slope, using the point-slope formula, and graphing.
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Khan Academy

Khan Academy: Parallel and Perpendicular Lines From Equation

For Students 9th - 10th Standards
Use your knowledge about the slopes of parallel and perpendicular lines to solve some problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Purple Math

Purplemath: Slope of a Straight Line

For Students 9th - 10th Standards
This lesson on slope explains the slope concepts, demonstrates how to use the slope formula, shows how to find slope in horizontal and vertical lines, and how to use slope to find whether the lines through the pairs of points are...
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Slope, Parallel & Perpendicular Lines & Transversals

For Students 9th - 10th Standards
Twenty-five problems cover the topics of slope, parallel lines, perpendicular lines, and transversals in different settings. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Gpe, G Srt Slope Criterion for Perpendicular Lines

For Teachers 9th - 10th Standards
The goal of this task is to use similar triangles to establish the slope criterion for perpendicular lines. Aligns with HSG-GPE.B.5 and HSG-SRT.B.5.
Handout
Purple Math

Purplemath: Slope: Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Describes and gives good examples relating to the slopes of parallel and perpendicular lines.
Activity
Texas Instruments

Texas Instruments: Investigating the Slopes of Parallel and Perpendicular Lines

For Teachers 9th - 10th Standards
In this activity, students investigate how equations of parallel and perpendicular lines relate to each other. They use the drawing and measurement tools of Cabri Jr. to explore the slopes of lines. [Requires Adobe Reader.]
Activity
Texas Instruments

Texas Instruments: Investigating Parallel and Perpendicular Lines Using Cabri Jr

For Teachers 9th - 10th Standards
Students use Cabri Jr. App to investigate the slopes and equations of parallel and perpendicular lines.
Activity
Texas Instruments

Texas Instruments: Explore Parallel and Perpendicular Lines

For Teachers 9th - 10th Standards
Students can use a graphing calculator to explore graphs of parallel and perpendicular lines. Students will find that parallel lines have the same slope and different y-intercepts and that the slopes of two perpendicular lines are...
Activity
Texas Instruments

Texas Instruments: Parallel and Perpendicular Lines on Ti Smartview

For Teachers 9th - 10th Standards
This is an introductory lesson on graphing parallel and perpendicular lines. The students will have a good visual on how these lines relate to each other. This also illustrates how to determine equations in slope-intercept form of a line...
Activity
Other

Git: What Is the Slope Intercept Form of a Line?

For Students 9th - 10th
Not only does this site show what the slope-intercept form is, but it helps you find the slope and the intercept of a line. There is also additional information on parallel lines, parametric form, and the distance between two points.
Lesson Plan
University of Regina (Canada)

University of Regina: Math Central: Characteristics of a Line

For Teachers 9th - 10th Standards
Characteristics of a line are explained to students through four different lessons. Topics include intercepts, slope, and special line cases. The lessons have an overview, materials, procedures, and evaluation techniques.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 10.4 Slope of Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Understand how to find the slope of parallel and perpendicular lines.
Graphic
National Council of Teachers of Mathematics

The Math Forum: Lines and Slope: Chameleon Graphing

For Students 6th - 8th Standards
Join Joan the chameleon in an exploration of lines and slope. You'll be drawing lines, calculating slope, using equations and more!
Unit Plan
University of North Carolina

University of North Carolina Wilmington: Lines in a Plane

For Students 9th - 10th Standards
This site from the University of North Caroline at Wilmington provides great information on the lines in a plane. The information that is given is in-depth and complete, touching on the slope of a line, equations of lines, and linear...
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Khan Academy

Khan Academy: Write Equations of Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Write the equation for a line that is a parallel or perpendicular to a line given in slope-intercept form and that goes through a specific point. Students receive immediate feedback and have the opportunity to try questions repeatedly,...
Unit Plan
Texas A&M University

Wtamu Virtual Math Lab: Beginning Algebra: Slope

For Students 9th - 10th
A tutorial on slope with many step-by-step examples. The tutorial clarifies what slope is, how to find slope between two points on a graph, and how slopes of parallel and perpendicular lines are related.
Unit Plan
Texas Education Agency

Texas Gateway: Coordinate Geometry: Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Given characteristics of two lines, such as slopes and equations, the student will determine whether the lines are parallel, perpendicular, or neither.
Handout
Northeast Parallel Architectures Center, Syracuse University

Npac Reu Program: Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Northeast Parallel Architecture Center, Syracuse University provides a brief definition of the slopes of parallel and perpendicular lines
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McGraw Hill

Glencoe Mathematics: Quiz on Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Learners demonstrate comprehension of advanced mathematical concepts in Algebra II. The questions check understanding on linear equations. Topics include writing equations of parallel and perpendicular lines.