The point about which the rotation occurs will remain in place, so the translation that happens after must move it to its corresponding location in the other triangle.
There are <em>three possible correct answers</em>:
180° about point E; right 3 and down 4 . . . (a) and (b)
180° about point G; left 3 and up 4 . . . (b) and (a)
180° about point H; right 5 and up 2 . . . (c) and (d)
I how this helped. Basically solve for X and see if you can. If you can't it is zero solutions, if you can solve it one way then it is one solution, and if will will always solve then it is infinite solutions.