Wolfram Research
Wolfram Math World: Triangle Inequality
This MathWorld site gives a good explanation of triangle inequality. The reader should be familiar with summation notation.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Solving Linear Inequalities: Picture a Number Line
Dr. Math presents a visual (graphical) approach to solving a conjunction inequality.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Polynomial Inequality Problem
This site from Drexel University answers student question about solving polynomial inequalities, "Dr. Math" provides a fairly thorough explanation in how to solve such problems.
Math Is Fun
Math Is Fun: Equal, Greater, or Less Than
Find definitions of the equal, not equal, less than, and greater than signs, as well as information what you are supposed to do with them and how they are used in general math and in algebra.
Math Planet
Math Planet: Systems of Linear Inequalities
A system of linear inequalities in two variables consists of at least two linear inequalities in the same variables. The solution of a linear inequality is the ordered pair that is a solution to all inequalities in the system and the...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Interval Notation
"Dr. Math" provides an explanation on how to express the solution of a conjunction inequality using interval notation.
Math Planet
Math Planet: Algebra 2: Graph Inequalities
How to graph an inequality is explained through examples and a video lesson. [4:14]
Math Open Reference
Math Open Reference: A Formal View of Limits
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: 45 45 90 Triangle
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Alternate Interior Angles
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Is Fun
Math Is Fun: Solving Inequality Word Questions
This tutorial models how to solve word problems which state that one unknown variable is greater or less than another. Includes detailed explanations of sample problems and ten practice questions to try.
Texas A&M University
Wtamu Virtual Math Lab: Intermediate Algebra
This site is a tutorial for students in algebra 2 or for those who need a refresher. The site has explanations, definitions, examples, practice problems and practice tests are found covering topics such as linear equations, graphing,...
Math Medics
S.o.s. Math: Solving Polynomial Inequalities
A short lesson on solving quadratic and polynomial inequalities.
Math Medics
S.o.s. Math: Sign of a Quadratic Function and Inequalities
This lesson discusses the sign of a quadratic function as it applies to inequalities.
Other
Quick Math: Graph Equations and Inequalities
This resource is from the QuickMath website that illustrates how to graph equations, inequalities and a system.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Solving a Logarithmic Inequality
"Dr. Math" from Drexel University responds to a student question about solving a logarithmic inequality.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Inequality
Dr. Math gives a hint of how to prove the triangle inequality theorem when answering a question posed about proving an absolute value problem using the triangle inequality theorem.
National Council of Teachers of Mathematics
The Math Forum: Nctm: Ask Dr. Math: Solving Inequalities
In response to a student question about solving an inequality, "Dr. Math" provides a general discussion of what is necessary to solve these types of problems.
University of Regina (Canada)
University of Regina: Math Central: Solving Absolute Value Inequality
In response to a student submitted problem that involves an absolute value inequality, a solution to the problem with an explanation of steps is given for you to follow. Site by University of Regina.
Math Open Reference
Math Open Reference: Triangle Inequality Theorem
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Triangle Inequality Theorem Converse
Learn about the Triangle Inequality Theorem Converse with this helpful reference tool. Provides a definition and interactive that enhance further explanation. Includes links to related topics.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Using Interval Notation to Express Answers
"Dr. Math" responds to a student question about solving an inequality involving a variable in the denominator.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Inequalities
"Dr. Math" responds to a student question about solving inequalities. Within the response, a list of the properties of inequalities is provided. Site by Math Forum
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Solving Inequalities W/ Absolute Values
In responding to a student question on how to solve absolute value inequalities, "Dr. Math" explains why it is necessary to solve two inequalities.