Answer:
A'(5.5, -4.2), B'(7.5, -9.2), C'(3.5, -3.2)
Step-by-step explanation:
I really do hope I understood you correctly. I figured that the rule would have to be added to each point. If those are wrong, try subtracting the rule.
Again, I'm not trying to take your points and leave you with a wrong answer. I really did give it my best.
All you have to do is add 125 by 75 and you get 200. Now you have to subtract 500 by 200 which is 300 and here you go your answer is 300. The bookstore has to sell 300 more books in order to sell 500 books by friday