9. find the glide reflection rule that maps triangle nop to triangle n'o'p'. 1 point (x, y) --> (x - 1, y + 4) and reflect across x = -1 (x, y) --> (x + 4, y -1) and reflect across x = -1 (x, y) --> (x - 1, y + 4) and reflect across y = -1 (x, y) --> (x + 4, y - 1) and reflect across y = -1