Hamburgers cost $3 and hotdogs cost $2 the total cost of buying b hamburgers and d hotdogs can be expressed by c=3b+2d. how can this equation be solved for d

Fred and gene are hang gliding. fred is 700 feet above the ground and descending at 15 ft/s. gene is decending as shown in the table. interpret the rates of change and initial values of the linear functions in terms of the situations they model. show all work. freds equation is f(x)=-15x+700. ( genes is the table attached)