Solve the system of equations and give your answer as an ordered pair: (x, y). Do not use spaces in your answer. If the system has no solution, type "no solution". If the system has an infinite solutions, type "infinite solutions".

Which options most accurately assess the impact of transportation improvements (e.g., railroads, canals, steamboats, transcontinental railroad) on the settlement of the west? ***(select all that apply.)*** a. they led to an increase in population density. b. they made it easier to travel long distances. c. they in establishing towns. d. they led to the development of the fur trade. e. they allowed for international travel.