Which of the following pairs of equations represents parallel lines?

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

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

C. 3x - y = 1 and 3x + y = 5

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

E. None of the above

Answer: A. 2x + y = 5 and 4x + 2y = 10

Two lines are parallel if their slopes are equal. The first pair has the same slope (2 and 4/2), indicating they are parallel.

Posted in: Linear Equations - Algebra - Mathematics