Question

Polygons EFGH and E'F'G'H' are shown on the following coordinate grid:

Answer 1

This would be modeled by a translation 1 unit down and a 270° clockwise rotation.

Each of these points has the x and y values switched, with the y value one less than that of the preimage and negated.  Taking one off the y-value is a translation 1 down; negating the y and switching it and x is a 270° clockwise rotation.