suppose the equation of line s is y=2. What are the coordinates of C' of /\A'B'C for Rs?

In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
A (-1,1)
B (1,-1)
C (-3,-1)
line s :
y = 2
Step 02:
Translation y = 2
C' ( - 3 , 5)
The answer is:
C' ( - 3 , 5)