Write an equation of the line that passes through (18,2) and is parallel to the line 3y-x=-12

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 .

What is the solution of sqrt x+2-15=-3

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1