Whats the answer for 12 (2w-3)=6w

Taking algebra two apex courses and need with these questions

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

With number 11 ( show how you got the answer)