Assign two variables for each problem, and write the equations. do not solve.

the math club is having their end-of-the-year party. natasha found that the cafeteria usually makes 200 cups of pineapple-ginger ale fruit punch. the cook told her that if she doubles the pineapple and triples the ginger ale, she will have a total of 420 cups of punch. how many cups of each are needed to make 420 cups of fruit punch?