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.
Unknown Type
Khan Academy

Khan Academy: Parallel & Perpendicular Lines From Equation

For Students 9th - 10th Standards
Use your knowledge about the slopes of parallel and perpendicular lines to solve some problems. For example, what's the equation of the lineperpendicular to y=3x-3 and passes through the point (-8, -2).
Handout
CK-12 Foundation

Ck 12: Geometry: Lines and Angles Study Guide

For Students 9th - 10th Standards
This study guide on lines and angles covers key terminology; line notation; parallel, perpendicular, and skew lines; and postulates and theorems about lines. It is available for download with free registration.
Unit Plan
Lawrence Hall of Science

The Math Page: Skill in Algebra: The Slope of a Straight Line

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains many topics surrounding the slope of a line, including slope of horizontal, vertical, parallel, and perpendicular lines in addition to the formula and concept of slope. There are...
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.
Unit Plan
Texas A&M University

Wtamu Virtual Math Lab: College Algebra: Parallel and Perpendicular Lines

For Students 9th - 10th Standards
Given a line, learn how to find the equations for lines that are perpendicular and parallel to it. This tutorial offers several example graphs and problems as well as practice problems for you to work through when you're ready.
Lesson Plan
PBS

Pbs Learning Media: Lines and Angles: Targeted Math Instruction

For Teachers 9th - 10th Standards
At the end of this lesson, students will be able to identify and apply the properties of lines and angles and understand the concept of parallel, perpendicular, complementary and supplementary angles, vertical angles, and parallel lines...
Unknown Type
Mr. Martini's Classroom

Mr. Martini's Classroom: Basic Geometry: Points, Lines, and Angles

For Students 3rd - 6th Standards
Students can review basic geometric terms using these self-check, multiple choice questions. Three levels of questions are provided.
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 A&M University

Wtamu Virtual Math Lab: Intermediate Algebra: The Slope of a Line

For Students 9th - 10th Standards
This tutorial will show you how to find a the slope of graph, write a linear equation in slope-intercept form. You'll also learn how to determine whether two lines are parallel or perpendicular to each other. For advanced math students.
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.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 5.3 Parallel and Perpendicular Line Constructions

For Students 9th - 10th Standards
Understand the step-by-step processes used to create accurate geometric figures.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Graphing Calculator Practice Problems: Geometry

For Students 9th - 10th Standards
Practice using your graphing calculator for geometry problems, including the use of the Pythagorean Theorem and the distance formula. If you get stumped or if you would like to check your work, then select the View Solution button, which...

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