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Course: Algebra (all content) > Unit 2
Lesson 11: Introduction to inequalities with variablesPlotting an inequality example
Drawing a number line helps visualize 'x is less than 4'. We mark 4 with a circle, not a dot, because 4 isn't included. Then, we color the line below 4, showing all values less than 4. Easy peasy, lemon squeezy. Created by Sal Khan and Monterey Institute for Technology and Education.
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