Which ordered pair is on the graph of the equation 3x + 7y = 11?
a) (1, 2)
b) (0,4)
c) (6, 1)
d) (0, 4)

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?