The population of a city increases by 4,000 people each year. in 2025 the population is projected to be 450,000 people. what is an equation that gives the city's population p (in thousands of people) x years after 2010?

If population in 2025 is 450 (in thousands) 
15 years prior (2010, it is 450 - 15(4) or 390 
now in years (p) after this date population increases 4 (in thousands) times the number of years. 

so formula would be p = 390 + 4p 

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