The equations x + y = 10 and 2x + 2y = 20 are related. Which of the following pairs of equations rep

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A. 3x + 3y = 30 and 4x + 4y = 40

B. x - y = 5 and 2x - 2y = 10

C. x + 2y = 8 and 2x + 4y = 16

D. 3x + y = 12 and 6x + 2y = 24

E. None of the above

Answer: A. 3x + 3y = 30 and 4x + 4y = 40

Both pairs are equivalent, showing the same relationship through proportionality.

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