Which of the following equations is the parametric representation of the solution set of the system of equations x + y = 3 x - y = 1 ?
(x, y) = (2 + t, 1 - t)
(x, y) = (1 - t, 2 + t)
(x, y) = (2 - t, 1 + t)
(x, y) = (1 + t, 2 - t)

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