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25 March, 21:26

Suppose you receive an allowance of $107 and your friend receives an allowance of $83 at the beginning of the month. If you spend $8 a day and your friend spends $4 a day, after how many days will you and your friend have the same amount of money?

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  1. 25 March, 21:47
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    6 days

    Y = 107-8x

    Y=83-4x

    You can use substitution

    83-4X = 107-8x

    Bring 8X

    Over to the left

    83 + 4x=107

    Subtract 83

    4x = 24

    X=6

    Or put in calculator and go 2nd graph you see table and on 6 day they both have $59
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