148k views
4 votes
Shelia opened a savings account she made an intial deposit. After her intial deposit she added money into the account each week after 4 weed she had $450 after 9 weeks she had $825 in her account. how much money is Sheila adding to her account each week.

1 Answer

5 votes

Linear Modeling

The amount of money Sheila has in her savings account can be modeled as a linear function:

y = mx + b

Where y is the money in the account, m is the amount that Sheila adds to the account every week, x is the number of weeks, and b is the initial deposit.

We are given the following data: The initial deposit is unknown but we have the points (4,450) and (9,825).

Since we are looking for the value of m (the slope of the line), we can use the formula:


m=(y_2-y_1)/(x_2-x_1)=(825-450)/(9-4)=(375)/(5)=75

Sheila adds $75 each week to her account

User Mike Malyi
by
8.4k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories