Solving Linear Systems by Substitution. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/math/algebra-basics/core-algebra-systems/core-algebra-systems-tutorial/v/solving-systems-of-equations-by-elimination?utm_source=YT&utm_medium=Desc&utm_campaign=algebrabasics
Missed the previous lesson? https://www.khanacademy.org/math/algebra-basics/core-algebra-systems/core-algebra-systems-tutorial/v/solving-linear-systems-by-graphing?utm_source=YT&utm_medium=Desc&utm_campaign=algebrabasics
Algebra basics on Khan Academy: Topics covered in a traditional college level introductory macroeconomics course
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Before You Test: DNA Basics You Need to Know, Part 1