Which of the following pairs of equations represents parallel lines?

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

B. 3x - y = 5 and 3x - y = 10

C. x - 2y = 1 and 2x - 4y = 2

D. y = 2x + 1 and y = 2x - 3

E. None of the above

Answer: D. y = 2x + 1 and y = 2x - 3

Both equations have the same slope (2), indicating they are parallel lines.

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