5m - 3n = 19; m - 6n = -7 /pls. help me solve this linear equation with two variables.

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

Answer this question! 30 points and brainliest! only if you know the answer.

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.