Which of the following pairs of equations has no solution?

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

B. x - y = 3 and x + y = 1

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

D. 3x - y = 7 and 3x - y = 5

E. None of the above

Answer: D. 3x - y = 7 and 3x - y = 5

The equations 3x - y = 7 and 3x - y = 5 represent parallel lines that never intersect, hence no solution.

Posted in: Linear Equations - Algebra - Mathematics