If 11 square meters of tile are available to make a rectangle whose width must be 6 meters less than its length, what would be the dimensions of the rectangle?
If you are really serious about only 11 meters^2 then
(w+6)w = 11
w^2 + 6 w - 11 = 0
(w+6)w = 11
w^2 + 6 w - 11 = 0