math

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At the beginning of the summer molly decided to add a little money into her sayings account every week. After seven weeks her account had $175. At the end of 15 weeks her account had $375. Assume that she put the same amount of money into her account every week and will continue to do so.

  • math -

    Sounds like a good plan.

    Was there a question in there somewhere?

  • math -

    I was trying to find the expression for the problem

  • math -

    I have to find the equation of the line, but I need the expression to solve it.

  • math -

    looking at the data, it appears she saved #25 each week. So, after x weeks, her saving y would be

    y = 25x

    You can work into that by noting that if

    y = mx+b

    when x=7,
    175 = 7m+b

    when x=15,
    375 = 15m+b

    so, 8m = 200
    m = 25

    Now you have

    y = 25x+b
    plugging either point shows that b=0, so

    y = 25x

  • math -

    How much was in her account four weeks after she began saving?

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    Oops wrong question
    I meant to ask
    When she started saving money, 203 shopping days were left until Christmas. How much money was in her account at Christmas?

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    well, you have the equation. How many weeks from the time she started saving, until Christmas? $25/week, babe.

    I assume you know how many days per week . . .

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    Thank you I got it....so helpful

  • math -

    I have that same question but every time I try to put the expression it says it's wrong can you please tell me the expression you used??

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