Math Open Reference
Math Open Reference: Intersection of Two Straight Lines
Learn about the intersection of two straight lines with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhance further explanation. Includes links to related topics.
Illustrative Mathematics
Illustrative Mathematics: The Intersection of Two Lines
The purpose of this task is to introduce students to systems of equations. It takes skills and concepts that students know up to this point, such as writing the equation of a given line, and uses it to introduce the idea that the...
Texas Instruments
Texas Instruments: Intersecting Lines and Planes
In these problems, students are asked to find: point of intersection of two lines; coefficients that make two lines parallel; intersection of diagonals of a quadrilateral; and the point of intersection of three planes.
University of Regina (Canada)
University of Regina: Math Central: Angle of Intersection of Two Lines
Use this question response site from the University of Regina about finding the acute angle of intersection between the two given lines. The response contains a visual aide and commentary to help.
PBS
Pbs Learning Media: Two Points Determine a Line
In this video segment [2:10] from Cyberchase, Digit must make a straight line between the two points and then follow the path created.
PBS
Pbs Learning Media: Two Sightings, Different Information
Jackie and Matt are looking at the same object along two different lines, in this video segment from Cyberchase.
Other
800score: Intersecting Angles
Read a description of intersecting lines and all about the different kinds of angles they form. Includes examples.
Texas Instruments
Texas Instruments: Angles Formed by Two Intersecting Lines
Students will investigate the properties of angles formed by intersecting lines. They examine the definition of adjacent angles, supplementary angles, and vertical angles and learn about two important geometric theorems dealing with...
City University of New York
Lehman College: An Introduction to Lines
Use this site for two short lesson plans regarding Euclidean and Spherical lines. Intersecting and parallel lines are discussed. The lesson contains activities for two days of class.
Texas Instruments
Texas Instruments: Intersecting Lines and Vertical Angles
In this activity, students visualize and explore the angles that are formed when two lines intersect. By measuring angles formed by intersecting lines, they enhance their understanding of vertical angles, supplementary angles, and a...
Texas Instruments
Texas Instruments: Parallel Lines, Transversals and Angles
This activity allows students to: 1. Identify the pairs of angles formed when a transversal intersects two lines.: 2. Measure angles Using Cabri Jr. 3. Identify relationships between pairs of angles when a transversal intersects parallel...
Other
New York State Education Department: Eighth Grade Math, Book Two (2010) [Pdf]
Part two of three; The March 2010 8th grade Math test from the State of New York. The test is six open-response questions covering topics such as geometry (intersecting / parallel lines, Pythagorean Theorem), measurement (maps), and...
University of Regina (Canada)
University of Regina: Math Central: Introduction to Slope for Middle Years Mathematics
This collection of five middle school math lessons covers the topic of plane geometry, specifically the concept of slope. The first lesson introduces middle schoolers to plotting points on a Cartesian grid using a Geoboard. Lesson two...
Illustrative Mathematics
Illustrative Mathematics: A Rei the Circle and the Line
Students are required to solve a system of equations in this task which will demonstrate their understanding of the correspondence between intersection points of the two graphs and solutions of the system. Aligns with A-REI.C.7.
Sophia Learning
Sophia: Finding Intersections: Lesson 5
This lesson demonstrates graphing two lines on a coordinate plane and determining the point where two lines intersect. It is 5 of 5 in the series titled "Finding Intersections."
Other
Git: What Is the Slope Intercept Form of a Line?
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.
TeachEngineering
Teach Engineering: Parallel and Intersecting Lines: A Collision Course?
Students act as civil engineers developing safe railways as a way to strengthen their understanding of parallel and intersecting lines. Using pieces of yarn to visually represent line segments, students lay down "train tracks" on a...
CK-12 Foundation
Ck 12: Interactive Geometry: 4.2 Theorems About Lines and Angles
Consider two parallel lines that are intersected by a transversal, and when it crosses the two others, many different angle pairs are formed. See the special properties of the angle pairs in this interactive.
CK-12 Foundation
Ck 12: Interactive Geometry: 8.8 Secant Lines to Circles
Learn about a line that intersects a circle in two points is called a secant line.
Oswego City School District
Regents Exam Prep Center: Locus Equidistant From Two Intersecting Lines
The fifth theorem of loci is investigated on this site. Click on the "Topic Index" link to find related practice activities and resources.
Sophia Learning
Sophia: Finding Intersections: Lesson 2
This lesson demonstrates graphing two lines on a coordinate plane and determining the point where two lines intersect. It is 2 of 5 in the series titled "Finding Intersections."
Sophia Learning
Sophia: Finding Intersections: Lesson 3
This lesson demonstrates graphing two lines on a coordinate plane and determining the point where two lines intersect. It is 3 of 5 in the series titled "Finding Intersections."
Illustrative Mathematics
Illustrative Mathematics: 8.ee Equations of Lines
In this task, 8th graders are presented with two intersecting line graphs and their linear equations. No values are shown on the axes. They are asked to interpret the constants in the equations in terms of their graphs, and make some...
PBS
Pbs: Graphing a System of Equations
Solve a number riddle by finding the point of intersection for two lines. This video focuses on finding the solution for a system of equations, they are represented as an algebraic expression and a set of linear equations that are...