Systems of equations with substitution: 2y = x + 7 and x = y - 4 (Full video)

Khan Academy

Supporting grades: 8

Description: Learn to use substitution to solve the system of equations 2y = x + 7 and x = y - 4. Created by Sal Khan and Monterey Institute for Technology and Education. Use substitution to solve for x and y. The first equation is 2y is equal to x plus 7. And we have the second equation over here, that x is equal to y minus 4.

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