What is the relationship between the 6s in 7664

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 .

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?