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Most linear equations are functions (that is, for every value of x, there is only one corresponding value of y). When you assign a value to the independent variable, x, you can compute the value of the dependent variable, y. You can then plot the points named by each (x,y) pair on a coordinate grid.
Solving One-Step Linear Equations (page 1 of 4) Sections: One-step equations, Multi-step equations, No solution and all x equations. Linear equations are equations with just a plain old variable like x, rather than something more complicated like x2 or x/y or square roots or such. Linear equations are the simplest equations that you'll deal with.