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Math Help - Build the formula, word problem, help!!

  1. #1
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    Exclamation Build the formula, word problem, help!!

    n 1950, the population density of the United States was 42.6 people per sq mile and in 2000 it was 79.6 people per sq mile. Assuming the population density grew at a constant rate of change, find the function that gives the population density based on the number of years since 1950.

    So far all I have gotten is y = .74x but I know I need it in y =.74x + b. I just can't figure out the +b part!

    Also, would x = the year?

    Thank you!
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  2. #2
    Master Of Puppets
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    x will be the year.

     y = 0.74x+42.6

    where x=0 represents the year 1950.
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  3. #3
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    Thank you so much for your help - I don't know why this one was so hard for me!
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