Savings Account Interest
You invest a total of $12,000 in two savings accounts paying 0.61% and 0.70% simple annual interest. If the
yearly interest is $75, how much of the $12,000 did you deposit into each account?
Review: To convert a percent into a decimal, move the decimal point two places to the left. For example,
3% becomes 0.03.
Part I
1. Write a system of equations that represents this situation.
a. Focus on the question at the end of the situation. What is unknown? Define variables to
represent these unknowns.
1
b. What are the TWO situations that are being described in the problem? Write an equation
that represents each situation.
2. Where do these lines intersect?
Enter both equations from Part 1 into the Desmos Graphing Calculator and write down the
intersection point. You may need to zoom out to find the intersection.