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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.
To solve systems of equation in two or three variables, we need to determine first whether the equation is consistent, inconsistent, independent, or dependent. A pair of linear equations, which has a unique or infinite solutions are said to be a consistent pair of linear equations.