Choose the linear inequality that describes the graph. the gray area represents the shaded region.

a: 3x – 7y < –21

b: 3x + 7y < –21

c: 3x – 7y < 21

d: 3x – 7y > –21

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?