Savannah went to the grocery store and purchased cans of soup and frozen dinners. Each can of soup has 200 mg of sodium and each frozen dinner has 350 mg of sodium. Savannah purchased a total of 13 cans of soup and frozen dinners which collectively contain 3050 mg of sodium. Write a system of equations that could be used to determine the number of cans of soup purchased and the number of frozen dinners purchased. Define the variables that you use to write the system.