In the graph below line “k” y =k makes a 45 degree

If m 17 27 90 63 ** picture is attached

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?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?