If the solution of the equations x + y = 10 and x - y = 2 is (6, 4), then which of the following pai

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A. 2x + 2y = 20 and 2x - 2y = 4

B. 3x + 3y = 30 and 3x - 3y = 6

C. x + 2y = 14 and x - 2y = 2

D. 4x + 4y = 40 and 4x - 4y = 8

E. None of the above

Answer: A. 2x + 2y = 20 and 2x - 2y = 4

Both equations in option a are equivalent to the original equations, thus sharing the same solution.

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