The midpoint (x, y) and the end point
(22, y2) are known. Find
(21, y1) using the midpoint formula.

(21, y1) = (x + 22, y + y2)
(21, yı) = (2x – 22, 2y - y2)
(21, y1) = (x – 22, y - y2)
(21, yı) = (2x + 22,2y + y2)

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?