What is the answer to -3 to the second power + 4.6 times -0.1

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 .

One integer is 8 times another. if the product is 72, then find the integers

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15