I can't tell you the answer because there is no image but to find a perpendicular lines slope you just take the slope and make it opposite.
Ex: Slope is 1/2 what is the perpendicular?
Ans: -2/1
Answer:
This is because despite being the largest city in the country, New York City only has around 6% of the total U.S. population when its metropolitan area is taken into account.
A primate city, on the contrary, is a city that has 20%, 30% or even 40% of the total population of the country, regardless of how much larger it is than the second city.