I don't understand how to do this and I am very confused.
If you want to solve the linear system by multiplying, pick a variable to eliminate. If you choose the x, multiply the line by the x coefficient of the other line.
Distribute the factor to each term.
Subtract each term from the line above
0 - 2y =-36
Solve for y.
Plug the value for y into one of the original equations and solve for x.
(-24,18) works for both equations.
There are variations to the method I used, but the solution will stay the same.