First, let's get the coordinates of UVWX
U(8, -1)
V(3, -1)
W(3, -6)
X(8, -6)
This transformed to;
U' V' W' X'
So let's find the coordinate of U' V' W' X'
U'(1, 9)
V'(-4, 9)
W'(-4, 4)
X' (1, 4)
8-7= 1
3-7 = -4
x -7 = x'
Also - 1+ 10 = 9
- 6 + 10 = 4
Hence,
(x, y) ⇒ (x - 7, y+10)