If the equations 5x + 2y = 20 and 10x + 4y = 40 correspond to each other, which of the following pai

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A. 14x + 6y = 42

B. 21x + 9y = 63

C. 28x + 12y = 84

D. 35x + 15y = 105

E. None of the above

Answer: A. 14x + 6y = 42

The second equation is a multiple of the first, maintaining the same relationship.

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