Hey do you guys think that i look pretty? or ugly be honest

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 .

Can someone me do math because i am having a breakdown rn because i don’t get it

Write an equation for the function that includes the points (2,100)and (3,100)