Systems of equations with substitution: 2y=x+7 & x=y-4 - Khan Academy
https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-with-substitution/v/the-substitution-method
WebAbout. Transcript. When solving a system of equations using substitution, you can isolate one variable and substitute it with an expression from another equation. This will allow you to solve for one variable, which you can then use to solve for the other. Created by Sal Khan and Monterey Institute for Technology and Education. Questions.
DA: 76 PA: 75 MOZ Rank: 24