Other
Harold Olejarz: Interactive Horizon Line
An interesting interactive slide show about perspective, including the horizon line and vanishing points.
Other
Linear Functions, Slope and Regressions
Find activities here for linear functions, slopes and regression lines. Use them for classroom work or individual assignments.
Discovery Education
Discovery Education: Web Math: Using a Number Line
This WebMath site provides an interactive number line "solver." Content includes helpful hint and a full explanation of the mathematical solution.
Sophia Learning
Sophia: Find Slope and Rate of Change
This learning tutorial demonstrates how to find the slope of a line and the rate of change for a table. The lesson includes several PowerPoint presentations about slope and even provides practice problems for students to test their...
Khan Academy
Khan Academy: Distance Between Points: Vertical or Horizontal
Practice finding the distance between two points on the coordinate plane that share the same x- or y-coordinate. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Hop's Gallery: Perspective Study
This webpage explores traditional perspective drawings as well as contemporary drawings, focusing on their use of horizontal and vertical lines.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Equation of a Line Parallel to an Axis
Dr. Math gives a short discussion on how to find the equation of a line parallel to an axis (, parallel or horizontal.)
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Graphing Lines
Complete this tutorial to learn how to graph a straight line if given the y-intercept and slope and how to graph horizontal and vertical lines. View examples of lines with different slopes, and practice working with slope-intercept form.
Texas Instruments
Texas Instruments: Implicit Differentiation
Students differentiate an equation in two variables with respect to one. They calculate points where the tangent line is horizontal, vertical, or oblique and use the graphing capacity of the TI-89 to display the graph of the implicit...
Quia
Ixl Learning: Slope
Brush up on your math skills relating to slope then try some practice problems to test your understanding.
Other
Relationships: Dynamics
The dynamics of shape in art and the relationship of shape with the other elements of art. The effects of angles and lines on perception.
The Math League
The Math League: Using Data and Statistics
This site contains two short examples of line graphs, charts that show change over time. This is a quick introduction to the topic of statistical graphing.
Windstream
Ojk's Precalculus Study Page: Reflections and Symmetry
An introduction to the various types of symmetries that can occur in the graphs of functions. Uses vertical, horizontal, and oblique reflections as a means of recognizing symmetries.
Curated OER
Science Kids: Science Images: Vertical and Horizontal Line Length Illusion
This is a vertical and horizontal line length optical illusion. The vertical line that is part of the image on the left looks longer than the horizontal line but when it is checked with a ruler on the right image it is proved that they...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: When Is a Slope 0 or Undefined?
At this site Dr. Math gives a discussion on the slopes of lines. The Dr. gives an analogy between the slope of a line and walking up and down hills. The Dr. explores the concept of undefined and zero slopes through his response to a...
Texas A&M University
Wtamu Virtual Math Lab: Intermediate Algebra: Graphing Linear Equations
A simple tutorial that will show you how to graph linear equations and functions after finding the x- and y-intercepts. Provides definitions, steps for sketching a graph, and several examples of linear equations and their graphs....
Quia
Ixl Learning: Linear Equations
Brush up on your math skills relating to linear equations then try some practice problems to test your understanding.
Oswego City School District
Regents Exam Prep Center: Algebra 2: Definition of Inverse Function
An introductory look at the definition of an inverse function, the notation used for inverse functions, and tests used to determine whether a function will have an inverse. Several examples are provided for the student to scroll through...
CK-12 Foundation
Ck 12: Algebra: Graphs of Linear Equations
[Free Registration/Login may be required to access all resource tools.] Students learn to use a table to graph functions recognizing linear equations and the equations of horizontal lines and vertical lines. Students examine guided...
ABCya
Ab Cya: Turkey Touchdown
What's more Thanksgiving than turkey and football? What about turkeys playing football? Turkey Touchdown is a great way for kids to celebrate the holiday and practice their math facts. Kids will choose a level of difficulty, and then...
Better Lesson
Better Lesson: Tracking Stocks and Distance on the Coordinate Plane
Which stock price had the largest change? How do you know? What is the distance between (a, 5) and (a, -3)? Students continue tracking their investments and work on strategies for calculating length of horizontal and vertical lines.
CK-12 Foundation
Ck 12: 3.3 Inverse Functions
This section explores the process for finding inverses of functions, and then proving the function and its inverse algebraically. Additionally, it explores how the graphs of functions and their inverses compare to each other, and it...
University of Cambridge
University of Cambridge: Nrich: Symmetry Challenge
Sharpen your logic, symmetry, and pattern recognition skills while working on this challenge. Solution included.
University of Cambridge
University of Cambridge: Nrich: Happy Halving
On this one page website expand your logic, symmetry and pattern recognition knowledge while working on this challenge. The solution is available to double check your solution.