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An linear equation is an algebraic equation that contains a variable to the first power and a constant. When graphed, linear equations always produce a straight line.
An example of a linear equation is y = x + 2.

en.wikipedia.org/wiki/Linear_equation

A linear equation is an algebraic equation in which each term is either a constant or the product of a constant and (the first power of) a ...

www.mathsisfun.com/algebra/linear-equations.html

Example: y = 2x + 1 is a linear equation: line on a graph. The graph of y = 2x+1 is a straight line. When x increases, y increases twice as fast, so we need 2x ...

tutorial.math.lamar.edu/Classes/Alg/SolveLinearEqns.aspx

Algebra (Notes) / Solving Equations and Inequalities / Linear Equations [Notes] ... Let's first summarize the process and then we will work some examples.

www.sosmath.com/algebra/solve/solve1/s13/S13/S13.html

LINEAR EQUATIONS - Solve for x in the following equation. ... If you would like to test yourself by working some problems similar to this example, click problem.

www.studygs.net/equations.htm

Instructions and examples of solving linear equations.

If it's not multiplication then it will look different. Different operations use different symbols, so we can tell them apart. Addition: 5 + x. Subtraction: 5 - x