Answer: To find the coordinates of F' and G', we need to reflect points F and G across the line y = 5, since point D is located on this line.
For point F, the y-coordinate changes from 11 to -1, since the distance between the line y = 5 and point F is 6 units (2 times the distance between D and the line). Therefore, the coordinates of F' are (3,-1).
For point G, the y-coordinate changes from 8 to 2, since the distance between the line y = 5 and point G is 3 units (1.5 times the distance between D and the line). Therefore, the coordinates of G' are (2,2).
Thus, the coordinates of F' are (3,-1) and the coordinates of G' are (2,2).