Solving linear systems by substitution | Algebra Basics | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/algebra-home/alg-system-of-equations/alg-solving-systems-of-equations-with-substitution/v/solving-linear-systems-by-substitution Solving Linear Systems by Substitution. Created by Sal Khan. Watch the next lesson ...
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· Apr 8, 2010