Algebra 1 honors

Mr. Oliver invested a total of $6400, part at 9% per year and the remainder at 8% per year. At the end of 2 years and 6 months, he had earced a total investment of $1380 in simple interest. How much ded he invest at each rate.

I have to come up with the equation.

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asked by Kearse
  1. .09x+.08x(30)= $1380 + $6400 = ?


    ......i think/hope that this is right....

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    posted by bex
  2. Bex, I have to have 2 different numbers. I have to find out how much he invested at each individual rate.
    I have .09x + .08(6400 - x)=1380.
    This equation is not correct. Someone please help me!!

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    posted by Kearse
  3. sorry.im not very good at algebra =[

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    posted by bex
  4. .09x+.08x(30)= $1380 + $6400 =

    (Multiply .08 X 30 = 2.4)

    .09x + 2.4x = 7780
    3.3x = 7780

    3.3x $7780
    ---- = -----
    3.3 3.3

    x = $2357.57

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    posted by Algebrologist
  5. i need 9 factors of 4x squared

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    posted by sexi kitten

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