If the equations x + 3y = 9 and 2x + 6y = 18 are related, which of the following pairs of equations

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A. 3x + 2y = 12 and 6x + 4y = 24

B. 4x + y = 10 and 8x + 2y = 20

C. 5x + 3y = 15 and 10x + 6y = 30

D. x - y = 3 and 2x - 2y = 6

E. None of the above

Answer: C. 5x + 3y = 15 and 10x + 6y = 30

Both pairs of equations are equivalent, as the second is a multiple of the first.

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