Ina has $40 in her bank account and saves $8 a week. Ree has $200 in her bank account and spends $12

Discussion in 'Calculator Requests' started by math_celebrity, Nov 1, 2016.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Ina has $40 in her bank account and saves $8 a week. Ree has $200 in her bank account and spends $12 a week. Write an equation to represent each girl.

    Let w equal the number of weeks, and f(w) be the amount of money in the account after w weeks:
    • Ina: f(w) = 40 + 8w
      • We add because Ina saves money, so her account grows
    • Ree: f(w) = 200 - 12w
      • We subtract because Ree saves
     

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