Darius owns a business that manufactures and sells record players, now that vinyl records have resurged in popularity. The graph shows Darius’s expected revenue and cost in relation to the price he sets for each record player. To make a profit, Darius should set the price for a record player between $ and $ .

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 .