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 Related Terms
 Linear Function:  An equation in which the graphs of the solutions form a (non-vertical) line.
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Variable: A letter or symbol used to represent a number.
Unknown: A variable whose values are solutions of the equation that they are written in.
Forming an Equation (Writing an Equation): Writing information presented in words as a mathematical sentence with an equality sign, operation symbols, numbers, and/or variables.
Equivalent Equations: Equations that have the same solutions.
Function: A rule of matching elements of two sets of numbers in which an input value from the first set has only one output value in the second set.
Linear Equation: An equation whose solution is a straight line.
Linear Inequality: An inequality in two variables for which the graphs of the solutions form a half-plane on one side of a line and may or may not also form the line itself.
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.
Solving an Equation: Finding all the values of the variable(s) that make an equation true.
Solving an Inequality: Finding all the values of the variable(s) that make the inequality true.