Since you're told that the airfare cost is 737 we know that this is a number that will not be varied in any way and that this number will be added to the number of nights that he pays for to stay at a hotel. We are also told that the cost per night is 164 and that x represents the number of nights that he stays. We can then have the following
for the second package we are told that it cost 249 for the round trip and 531 per night at a hotel. Moreover, once again x represents the number of nights that he will be staying at the hotel, giving the equation
therefore, option C is the correct answer.