Algebraic inequalities can be solved in the same fashion as algebraic equations. The goal here, as in algebraic equations, is to isolate the variable. The one thing to remember, however, is that when dividing or multiplying both sides by a negative number, one must switch the inequality sign.
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The same way you do for simple algebra. The complication on each side don't change the rules; you are still doing algebra.
The easiest way to solve an algebra problem is to work out the problem.
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To solve it by coordinate graphs you would take a point from the line and plug in the X and Y value into the equations and or inequalities.
Not easy...