floricultores venden 850 decenas de macetas de flor de Nochebuena en ocho días de un invernadero de 85 m de largo y 30 m de ancho cuantas decenas de macetas venderán dos floricultores durante 18 días de un invernadero de 5000 m²

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Ill mark the brainliest if you me with the these three questions 7,8,9

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.