Solving Linear Systems By Substitution | Algebra Basics | Khan Academy

Solving Linear Systems by Substitution. Created by Sal Khan.

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Algebra basics on Khan Academy: Topics covered in a traditional college level introductory macroeconomics course

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22 thoughts

  1. why cant we just learn this directly instead of going througj graphing before this? its so annoying

  2. I dont get it, its probably not you but someone please help. I have a quiz on this tommorow

  3. For some reason it’s funny to me that he refers to the x=9-2y as “this thing” 😛 2:00

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