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A-REI.C. Solve systems of equations.

    A-REI.C.5. Prove that, given a system of two equations in two variables, replacing one equation by the sum of that equation and a multiple of the other produces a system with the same solutions.

    A-REI.C.8. Represent a system of linear equations as a single matrix equation in a vector variable.

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    A-REI.C.9. Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension $3 \times 3$ or greater).

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