Question 107862
Find a linear equation in the form P = mt + b (y = mx + b), which gives the population, P, t years from 2010. 4000 starting poulation increases by 200 a year. in 30 years what would the population be. 
This is all I can think of 200(30)+b(y=200+b)
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Equation Form: P(t) = mt + b
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Your problem:
P(t) = 200(t-2010)+4000
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Thirty years after 2010 the population will be
P(2040) = 200(2040-2010)+4000
P(2040) = 200(30)+4000
P(2040) = 6000+4000 = 10,000
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Cheers,
Stan H.