How do you break down a fraction 3 times

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

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?

How do you determine if an ordered pair is a solution to a given equation?