Wyatt went to the grocery store and bought bottles of Soda and bottles of juice. Each bottle of Soda has 30 grams of sugar and each bottle of juice has 40 grams of sugar. Wyatt purchased 2 more bottles of juice than bottles of Soda and they all collectively contain 430 grams of sugar. Write a system of equations that could be used to determine the number of bottles of Soda purchased and the number of juice purchased. Define the variables that you used to write the system.