Suppose you invest $3,600.00 in two accounts paying 2% and 7% annual interest, respectively. The total interest earned for the year is $182.00. For the following problems, use $x$ for the amount invested at 2% and $y$ for the amount invested at 7%.

a) Write a mathematical expression for the total amount of money invested.
Answer:

b) Write a mathematical expression for the total interest earned.
Answer:

c) How much money was invested at 7%?
Answer: