ok here's a few i'm not sure if they're right or not and the last one I just can't seem to understand, hope someone can help!!

i'd greatly appreciate it!

give an equation of a line that is perpendicular to the line

y=1/3x+1

I have y=-3x+2 or y=-3x-1

find a point slor form of the line passing through (1980,5) and (2000,45)

i have y=2x+5

I'm really confused about that one!

find an equation of the line that horizontal, passing through (3/4,-5/6)

y=-5/6, right?

I don't understand this one at all:

the number of radio stations on the air from 1950 to 1995 may be modeled by

f(x)214.3x-415,368, where x is the year

how man radio stations were on air in 1980

what is the slope of the graph

interept the slope as a rate