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Math Help - Reversing an equation... stuck!

  1. #1
    Newbie
    Joined
    Oct 2007
    Posts
    4

    Reversing an equation... stuck!

    I seem to get stuck on these....

    Find a linear equation in the form P = mt + b (y = mx + b), which gives the population, P, t years from 2010.

    Answer: P(y) = 20x + 1500
    Show your work here:
    20 represents the growth rate
    X represents the number of years (t)
    B represents the initial population for 2010
    Is this right? And then.....

    Use your equation in part b to approximate the population in the year 2030.

    Answer:Population 1900 in the year 2030
    Show your work here:
    P(y) = 20x + 1500 x = 20
    P(y) = 400 + 1500
    P(y) = 1900

    Finally... and this is where I get stuck.....

    Use your equation in part b to approximate how many years it will take the population to reach 7000.

    Any help will be greatly appreciated

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  2. #2
    Junior Member
    Joined
    Jun 2007
    Posts
    65
    7000 = 20x + 1500

    Solve for x
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  3. #3
    Newbie
    Joined
    Oct 2007
    Posts
    4
    why is that so simple? Yet I can't see it???

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