HELP ME PLEASE DONT GIVE ME A LINK I JUST NEED AN ANSWER AND EXPLANATION ​

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?

Hundred and tens tables to make 430 in five different ways

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