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Solve the system with the addition method:

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1 Answer

7x-4y = 5......(1)

21x-12y = 15......(2)

Since dividing each term of the equation (2) by 3 gives you the equation (1), you actually have only one equation with two variables. Therefore, the solution is

{t, (1/4)(7t-5)}, where t can be any number.