Answer:
(-31,15)
Step-by-step explanation:
Rotating 90 degrees clockwise is very simple:
(a,b) 90 degrees= (-b,a)
Very simple.
Just switch sides and add negative to the first term.
2tfffff ttttttt5 555tt
+5 is the slope
1/2
(-2-(-1))/(-4-(-2))=1/2