Can someone please help me on this

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 .

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Graph the line with the given slope m and y-intercept b. m=-3,b=1