Which of the following is an equivalent system of equations to x + y = 5 and 2x - y = 1?
2x + 2y = 10, 4x - 2y = 2
x + y = 5, 2x - y = -1
x - y = 5, 2x + y = 1
x + y = 5, 2x + y = 7

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