Find a 3 by 3 magic square using numbers 2,5,8,12,15,18,22,25,29

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 .

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?