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Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Graphing Inequalities One Variable
Find a quick, concise explanation of how to graph a one variable inequality. An example is given and clearly explained.
Sophia Learning
Sophia: Equations of Several Variables: Lesson 2
This lesson explains how we might represent an equation in terms of more than one variable. It is 2 of 5 in the series titled "Equations of Several Variables."