The avenues in a particular city run north to south and are numbered consecutively with 1st Avenue at the western border of the city. The streets i
the city run east to west and are numbered consecutively with 1st Street at
the southem border of the city. For a festival, the city is not allowing cars to
park in a rectangular region bordered by 6th Avenue to the west, 10th Avenue
to the east, 11th Street to the south, and 13th Street to the north. If x is the
avenue number and y is the street number, which of the following systems
describes the region in which cars are not allowed to park?