Find the range of relation y =3(x-2)5y for domain { -8,-4,0,4,8

Aquadratic function f(x) has a turning point at (3,-7). what is the turning point of -f(x)?

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 .

Ineed in figuring out this problem.