A coin purse contains a mixture of 31 dimes and quarters. The coins have a total value of $5.95. For the following problems, Use $x$ for the number of dimes and $y$ for the number of quarters.

a) Write a mathematical expression for the total number of coins.
Answer:

b) Write a mathematical expression for the total monetary value in the purse.
Answer:

c) How many dimes are in the coin purse?
Answer: