Which of the following pairs of equations has no solution?

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A. x + y = 5 and x + y = 10

B. 2x - y = 3 and 4x - 2y = 6

C. 3x + 4y = 12 and 6x + 8y = 24

D. x - 2y = 4 and 2x - 4y = 8

E. None of the above

Answer: A. x + y = 5 and x + y = 10

The first pair represents two parallel lines that will never intersect, hence no solution exists.

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