Answer:
Now how did I find the translation rule ( x - 1, y + 4). Well basically, I did was
8 - 9 = -1
-4 - (-8) = 4
Now if you use the same translation rule for (9, -8), you will get :-
(x - 1, y + 4)
( 9 - 1, -8 + 4)
( 8, -4)
I get the same answer that is given in the problem.
Hope this helps, thank you !!