What is an equation in point-slope form that passes through the points (8,-2) and (1,-6)?

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 .

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The total number of dental clinics total for the last 12 months was recorded