Regular sandwiches are sold with 3 pickles and 2 tomato slices. Deluxe sandwiches are sold with 5 pickles and 3 tomato slices. Suppose that you have 1100 pickle slices and 700 tomato slices. How many of each type of sandwich can you make using all the pickle and tomato slices?
if there are x regular and y deluxe sandwiches,
3x+5y = 1100
2x+3y = 700
(x,y) = (200,100)