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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 a system of linear equations by elimination means by adding or subtracting the equations to get rid of a common variable. 1  Basic concepts: 2  Adding and subtracting polynomials. 3  Solving linear equations with variables on both sides.  Determining number of solutions to linear 1  equations. Related concepts:  System of linear equations.