Explain why the two equations below have the same solutions.
x + 3y = −1

−2x − 6y = 2

A. The two equations have the same slope, so they have the same solutions.
B. The second equation is a multiple of the first equation, so they have the same solutions.
C. The graphs of the equations are parallel and do not intersect, so any solution of one is a solution of the other.
D. The lines are perpendicular, so they have the same solutions.