The sum of three consecutive integers is 696. find the third integer.

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 .

I'm confused on this could anyone me and show me what i need to do to solve it.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?