Which of the following pairs of equations represents parallel lines?

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

B. 3x - 2y = 6 and 3x - 2y = 12

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

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

E. None of the above

Answer: C. x - y = 1 and x - y = 3

The equations x - y = 1 and x - y = 3 have the same slope but different intercepts, indicating they are parallel.

Posted in: Linear Equations - Algebra - Mathematics