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!
Lesson Plan
TeachEngineering

Teach Engineering: Graphing Equations on the Cartesian Plane: Slope

For Teachers 7th - 9th Standards
The lesson teaches students about an important characteristic of lines: their slopes. Slope can be determined either in graphical or algebraic form. Slope can also be described as positive, negative, zero or undefined. Students get an...
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Relations and Functions

For Students 9th - 10th Standards
Hotmath provides 25 practice problems dealing with relations, functions, and their graphs. Each of the practice problems include a step-by-step guide for solving their Algebraic problem.
Interactive
Mangahigh

Mangahigh: Shape: Construct Bisectors and Other Lines

For Students 9th - 10th Standards
Test your knowledge of construting bisectors on lines.
Activity
Washington State University

Washington State University: Slope Intercept, Point Slope Forms

For Students 9th - 10th Standards
Washington State University provides a lesson on finding the slope of an equation and putting the equation into the desired form. The site also contains informatinon concerning parallel and perpendicular lines.
Activity
Texas Instruments

Texas Instruments: Parallel Horses

For Teachers 9th - 10th
Using the activity center and the Navigator software, the students will review ordered pairs, and the equations for horizontal, parallel, and perpendicular lines.
Lesson Plan
PBS

Pbs Learning Media: Lines and Angles: Targeted Math Instruction

For Teachers 9th - 10th Standards
At the end of this lesson, learners 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...
Activity
Texas Instruments

Texas Instruments: Writing and Solving Systems of Equations Using Cabri Jr.

For Teachers 9th - 10th
Through this introduction to the use of the Cabri Jr. application in the Algebra classroom, students will algebraically and graphically determine equations of lines, as well as determine solutions to systems of linear equations. Using...
Lesson Plan
Oswego City School District

Regents Exam Prep Center: Slopes and Equations of Lines

For Teachers 9th - 10th
Three resources for teaching slopes and equations of lines: a lesson with a formula for finding slope, different equations for lines, and several examples; a fourteen-question quiz covering slope, perpendicular and parallel lines, and...
Unit Plan
Wolfram Research

Wolfram Math World: Perpendicular Lines

For Students 9th - 10th Standards
This site explains what perpendicular means geometricly in mathematics, gives reference to orthoginality, and explains notation for perpendicular segments or lines.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining Whether Lines Are Perpendicular

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch two videos and attempt practice problems on how to determine if two lines are perpendicular.
Handout
CK-12 Foundation

Ck 12: Geometry: Angles and Transversals Study Guide

For Students 9th - 10th Standards
This study guide on angles and transversals covers key terms, angle types formed by transversals, postulates and theorems about transversals, and how to prove if lines are parallel or perpendicular. It is available for download with free...
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...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Gpe, G Co, G Srt Unit Squares and Triangles

For Teachers 9th - 10th Standards
In this task, students are shown three unit squares and two line segments connecting two pairs of vertices. They are asked to find the area of a triangle formed by intersecting lines. They can solve it using coordinate geometry or...
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Relations and Functions

For Students 9th - 10th Standards
Hotmath provides eighteen practice problems dealing with relations, functions, and their graphs. Each of the practice problems include a step-by-step guide for solving their Algebraic problem.
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.
Whiteboard
ClassFlow

Class Flow: Discovering Lines

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart defines Parallel, Intersecting, and Perpendicular lines. It also provides opportunities to practice working with Parallel, Intersecting and Perpendicular Lines!
Whiteboard
ClassFlow

Class Flow: Segments and Polygons

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart reviews segments, parallel and perpendicular lines and then introduces polygons including quadrilaterals. It has many real world examples of shapes and includes Activote assessment.
Handout
University of Georgia

University of Georgia: Inter Math: Perpendicular Lines

For Students 9th - 10th Standards
This site from InterMath opens with a very simple definition of perpendicular lines and has links to challenging problems, more information, related terms and everyday examples of perpendicular lines.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G C, G Co Tangent Lines and the Radius of a Circle

For Teachers 9th - 10th Standards
In this task, students are shown a circle with center O and point P on the circle. L is a line that is a tangent to the circle at P. They must show that line OP is perpendicular to line L. Aligns with G-C.A.2, G-CO.A, and G-CO.C.9.
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.
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.
Handout
Math Open Reference

Math Open Reference: Points and Lines

For Students 9th - 10th Standards
A complete reference guide to points, lines, and planes. It provides definitions and interactive activities that enhance further explanation.
Activity
Math Is Fun

Math Is Fun: Using a Ruler and Drafting Triangle

For Students 3rd - 8th Standards
Students learn how to construct parallel and perpendicular lines. The resource consists of video demonstrations.