Which of the following pairs of equations represents parallel lines?

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

B. y = -x + 4 and y = x + 2

C. 2x + 3y = 6 and 4x + 6y = 12

D. x + 2y = 5 and 2x + 4y = 10

E. None of the above

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

Parallel lines have the same slope; both equations in option a have a slope of 2.

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