Which of the following pairs of equations has no solution?

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A. x + y = 5 and 2x + 2y = 10

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

C. x + y = 4 and x + y = 6

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

E. None of the above

Answer: C. x + y = 4 and x + y = 6

The equations x + y = 4 and x + y = 6 represent parallel lines, hence no solution exists.

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