What is (2x - 4) - (6x + 6)

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

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?

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?