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Systems of equations with elimination: 4x - 2y = 5 and 2x - y = 2.5 (Full video)

Khan Academy
Supporting grades: 8

Description: Sal demonstrates how to solve the system of equations 4x - 2y = 5 and 2x - y = 2.5 using the elimination method. We're told to solve and graph the solution for the system of equations right here. So let's multiply this equation, this second equation, by negative 2. So I'm going to multiply both sides of this equation by negative 2.

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