Choose the equivalent system of linear equations that will produce the same solution as the one given below.

6x + 2y = -6

3x - 4y = -18


A: 12x + 4y = -12

15x = -30


B: 8x + 4y = -4

14x = -10


C: 6x - 8y = -36

-6y = -42


D: 6x - y = -15

3y = 9