EASY POINTS:
this has become a very popular question so i'm re posting it and whoever can solve it first gets 50 points (or higher)
part 1: explain what reflections are in your own words
part 2: solve - p'(5, -4) for the glide reflection where the translation is (x,y) -> (x - 2, y - 3) and the line of reflection is y = -x