What is my answer to this problem

Pls! does anybody know a shortcut for answering these types of questions in the future?

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?