Can anyone help me with this one

Solve: 3x+y=6 4x-2y=18 show all work !

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?

Which of the following equations is equivalent to x/3-6/x=1