A polygon is shown on the graph:
A polygon is shown on a coordinate plane. Vertex A is located at (2,- 1), vertex B is located at (1, -4), vertex C is located at (3- 5), vertex D is located at (5,- 3).
If the polygon is translated 3 units down and 4 units left, what will the coordinates of the new image be? Use prime notation in expressing the new coordinates.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.