Technology in College Algebra – Graphing Linear Inequalities in Two Variables – TI-89. See http:__www.mathheals.com for more videos

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Here is the whole video series: https://www.youtube.com/watch?v=XUn4XCEcVfQ&list=PLsT0BEyocS2KVRpWjtshcOjX9beNo94UN In this video, I show you a property of sigma that allows you to go from double sum to product of sums.