Question 147589
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 
Correct
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find a point slope form of the line passing through (1980,5) and (2000,45)
i have y=2x+5
Correct
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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? 
Correct
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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 many radio stations were on air in 1980
what is the slope of the graph
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Your equation is messed up; but it looks like the slope is 214.3
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interpret the slope as a rate
The # of radio stations increases at a rate of 214.3 per year.
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Cheers,
Stan H.