Which of the following pairs of equations represents parallel lines?

A. 2x + y = 4 and 4x + 2y = 8

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

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

D. x - 2y = 1 and 2x - 4y = 2

E. None of the above

Answer: A. 2x + y = 4 and 4x + 2y = 8

The equations 2x + y = 4 and 4x + 2y = 8 are equivalent, representing the same line, hence they are parallel.

Posted in: Linear Equations - Algebra - Mathematics