Answer:
if your solving for n.....
Step-by-step explanation:
n=3
The answer would be choice C.
Perpendicular lines cross each other and form a right angle as you can see marked in the third picture.
Make the x axis seconds and y axis floors. Your first point would be at (0,-2), then (1,3), then (2,8) and so on.
You could scale the axes just going by one