Estimate products of fractions 2/3*26=

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

How to do this , and can some one explain

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?