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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.
This method can be described as follows: 1  In the first equation, solve for one of the variables in terms of the others. 2  Substitute this expression into the remaining equations. 3  This yields a system of equations with one fewer equation and one fewer unknown.