solve for x and y: 3x+y=13

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• We try to solve the equation:


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• We insert the solution into one of the initial equations of our system of equations


• We get a system of equations:


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• We insert the solution into one of the initial equations of our system of equations


• For :




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• We get a system of equations:


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I don't know Melancholy, your original equations are different from the ones in the question.