Additional mathematics, anyone? your is very much appreciated

If angle 2=3x +1 and angle 3=2x +4what is angle 2

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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?