Sandra writes a function to represent the amount of money in her bank account, y, each week, x, this year. She adds the same amount each week. Before she started adding money, she was overdrawn, with a balance of −$4.00. Which function could model the balance in Sandra’s account?

y = Ax - 4

Step-by-step explanation:

Given that:

Amount of money in account = y

Per week, x

Amount added to account per week is the same

Balance in account prior to saving = initial balance = - $4

The balance in Sandra's account :

y = (amount per week * number of weeks) + initial balance

Since the amount added per week is the same, then it can be represented as a constant, A

Hence, the function becomes ;

y = Ax + (-4)

y = Ax - 4

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