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We've solved equations before. In this video, we enter the world of inequalities. We discuss what OR and AND have to do with inequalities - how they make slack and double inequalities. We then categorise inequalities into different groups - Numerical and Literal inequalities, Strict and slack inequalities, Inequalities with one and two variables, Linear and quadratic inequalities. We finally look at the formal definition of linear inequalities. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! (https://www.khanacademy.org/math/ncer...) Timestamps: 00:00 Difference between an equation and an inequality 01:31 Slack inequalities (the operator OR) 04:45 Double inequalities (the operator AND) 07:28 Numerical and Literal inequalities 08:10 Strict and slack inequalities 08:46 Inequalities with one and two variables 09:27 Linear and quadratic inequalities 11:02 Formal definition of linear inequalities Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Ashish Gupta