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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 a quadratic equation by factoring, 1  Put all terms on one side of the equal sign, leaving zero on the other side. 2  Factor. 3  Set each factor equal to zero.  Solve each of these 1  equations. Check by inserting your answer in the original equation.