Point E is exterior to APD
The slope is m=3/4. Hope this helped you with your work let me know if I got the answer correct.
Yes, it’s option one where y is neg five
The greatest remainder with 3 is 2, the greatest remainder with 8 is 7, and the greatest remainder with 5 is 4, all because if it was one more then it would not be remaining and it would be without a remainder. Hope this helps!