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https://www.khanacademy.org/math/grade-8-math-tx/x42e41b058fcf4059:untitled-135/x42e41b058fcf4059:simultaneous-linear-equations-systems-of-equations/v/visually-verifying-a-solution-to-a-system

Given a graph of a system of two linear equations, verify if a given value of x is a solution to the system.

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