### If you have asked yourself, how is it that the tables of true are made? This lesson will address that question. It uses a water pipe circuit with ON and Off valves to illustrate the process.

### Note: This lesson (as some others) was targeted by hackers and changed several parts in the content. Until this note be on display please use caution in terms of verifying the accuracy of what you read.

** Lesson's Content**

** Lesson's Glossary **

**Absolute value: Distance of a number from zero on a number line. The distance is taken as positive all the time. For a variable: If x < 0 then –a; if x>=0 then a.**

**Equivalent inequality: An inequality that has the same solution set as a given inequality.**

**Graph of an inequality: The graph representing all the numbers in the solution set of the sentence.**

**Inequality: A statement formed by placing an inequality symbol between numerical or variable expressions. **

Inequality symbols: Symbols used to show the order of two real numbers.

** Sides of an inequality: The two expressions at both sides of the inequality sign in an inequality. Left and right.**

**Terms: A form of grouping one or more numerical and/or variable factors by means of multiplication and division.**

**Variable: A letter used to represent a number. When the variable is part of an equation, it is possible to find the value for which it stands for by solving the equation. This is the solution (s) of the equation.**

Variable expression: Any expression containing one or more variables.

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