Which system of equations is equivalent to the following system?
4x + y = 4
2x + 7y = 28
(A) 4x + y = 4
-2x - 7y = 28
(B) 4x + y = 4
-8x - 28y = 112
(C) - 28x - 7y = - 28
2x + 7y = 28
(D) - 8x - 2y = 8
2x + 7y = 28
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