help plz

A little tricky  !!!

I  to D   we go back 5

5 to 7   we go up 2

So   (x - 5, x + 2)  ⇒ "b"

10 left, 3 down   =  (x - 10, y - 3)  ⇒  "d"

We only need to look at one vertex and its after-image....look at C, C'

C =   (2, - 2)      C'  =  ( -2, -7)

So    (  x - 4,  y  - 5)  ⇒  "b"