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

[math_celebrity]

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