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Math Help - 5th Grade Algebra Help

  1. #1
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    Exclamation 5th Grade Algebra Help

    Hi, I'm hoping someone can help a math illiterate mom!
    I'm trying to help my son with an 'Input/Output' problem, and we're stuck on the last problem! The table has most of the problems solved, but they are making no sense to me. They have:
    Input/Output
    0/-8
    3/4
    34/128
    50/192
    10/
    100/
    I'm not looking for the answers, just help on what expression they're using to get these. I'm lost! Thanks so much in advance!
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  2. #2
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    Hi,

    See what happens if you try and fit the outputs to a linear function and solve it as a simultaneous equation.

    For example, using the second and third inputs/outputs

    3n + c = 4
    34n + c = 128
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  3. #3
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    I'm so sorry, that was like latin to me. I don't think they are that far. They are just beginning algebra and all the other expressions are VERY simple like 6n+4
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  4. #4
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    Ah, I apologise.

    They appear to be multiplying the input by 4 and then subtracting 8.
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  5. #5
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    You are an angel! Thank you so much!!!
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