The scale of a map says that 4cm represents 5km. what distance on the map in centimeters represents an actual distance of 10km

Chose the graph below that represents the following system of inequality’s

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 .

Name the most appropriate metric unit for each measurement