Question

What is the correct descriptin for the translation of a to a? a(10, 3) - a'(1, 6)

Answer 1

From a to a', it is a translation transformation of T_(-9,+3) : (x,y) -> (x-9,y+3).
The transformation a' to a is the inverse transform of the previous translation,namely
t^(-1): (x,y) -> (x+9,y-3)