20 POINTS PLEASE HELP A math student correctly solved the system of equations shown below using the inverse matrix.

3x+y=12x−3y=19

Which of the following methods did the student most likely use to find the solution to the system of equations?
A
[xy]=[3 2 1 −3][1 19]

B
[xy]=1−11[3 2 1 −3][1 19]

C
[xy]=[ −3− 2 −1 3][1 19]

D
[xy]=1−11[ −3− 2 −1 3][1 19]