More fr33 points for u amazing people, stream scientist by twice while ur at it :))

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1