I need help with this question.

The function g(x) is defined as shown. x-1, -2 g(x) = 2x+3, -1 6-x, x23

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 .

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.