Which of the following statements best describes the graph of x + y = 4? it is a line which intersects the x-axis at (4, 4). it is a line which intersects the y-axis at (4, 4). it is a line joining the points whose x- and y-coordinates add up to 8. it is a line joining the points whose x- and y-coordinates add up to 4.

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?