Question

See the geometry regents question above.

Answer 1

Cool question (Although it is tough somewhat)
1st step is to visualize the change from C to C' 

we have C'(8,-3) and C(3,-8) supposedly for C because it doesn't show any real values.. Nonetheless 
from C to C' there has been a rotation of 90 degrees clockwise 
proof:
Clockwise 90 degrees rotation law : (x,y) --> (y,-x)  and it proves the change from C to C' 

Therefor 
all left to do is estimate the B point coordinates and implement the law of rotation 
B(8,-7) Now implement a rotation of 90 degrees clockwise
we would get 
B'(7,-8)
Hope that helps