Just solve for this idrc abt the explanation so don’t waste your time

Taking algebra two apex courses and need with these questions

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)