Michael went to the grocery store and bought bottles of soda and bottles of juice. Each bottle of soda has 40 grams of sugar and each bottle of juice has
20 grams of sugar. Michael purchased a total of 11 bottles of juice and soda
which collectively contain 300 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 bottles of juice purchased. Define the variables that you use to
write the system.