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Math Help - linear equaton one variable

  1. #1
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    linear equaton one variable

    in 2006, mail rates were $.39 for the first ounce plus $.24 for each additional ounce. If Sabrina spent $15 for 45 stamps of these two denominations how many did she buy of each?
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  2. #2
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    Quote Originally Posted by dymand68 View Post
    in 2006, mail rates were $.39 for the first ounce plus $.24 for each additional ounce. If Sabrina spent $15 for 45 stamps of these two denominations how many did she buy of each?
    Hi dymand68,

    Methinks something is missing here. Maybe you mixed two problems in one.

    The linear representation for the first sentence would be:

    y=.24x+.39

    but I don't know how that relates to the second part. What two denominations?
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    linear equation one variable

    Quote Originally Posted by dymand68 View Post
    in 2006, mail rates were $.39 for the first ounce plus $.24 for each additional ounce. If Sabrina spent $15 for 45 stamps of these two denominations how many did she buy of each?

    Let x = the number of .39 stamps and45-x = the number of .24 stamps
    Write equation of the amount spent for each denomination and the total =15


    bjh
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  4. #4
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    i paraphrased the exact question from the book, but that's all the key data...$15 spent on 45 stamps, some were $0.39, the rest were $0.24... how many of each?
    the solution is 28 @ .39 and 17@ .24....i have not established the equation
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  5. #5
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    re: "...the amount spent for each denomination..."
    .39x + .24(45-x)=15
    ???
    BINGO
    .15x+10.8=15
    15x=420
    x=28
    Last edited by dymand68; March 29th 2010 at 12:29 PM.
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