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 Related Terms
 Unknown:  A variable whose values are solutions of the equation that they are written in.
Equation: A mathematical sentence that contains an equals sign.
Variable: A letter or symbol used to represent a number.
Solving an Equation: Finding all the values of the variable(s) that make an equation true.
Solution: A number (or ordered pair of numbers, or set of numbers) that produces a true statement when substituted for the variable(s) in an equation or inequality.
Inequality: Any mathematical sentence that contains the symbols >(greater than), <(less than), <(less than or equal to), or >(greater than or equal to).
Solving an Inequality: Finding all the values of the variable(s) that make the inequality true.