I'm not sure how to get this solution, I believe it has something to do with the chain rule but I can't figure it out

l. Let z=f(x,y], wherex =g{u, 1r] andy = My, 1:]. Then 2 =f(3(u, 1:], My, v3] = FIH, v} is a mctic-n of u and v. Suppose the following values are know: 1\"\": 2}=3,fx{1, 2F Safla 3}=1; 3(3: 5) = l! 343: 5) = 2! 31131 5} = _1; M3: 5] = 2, #43, 5) = 4, F1113, 5} = 3. FindFu andFvat u = 3, 1r= 5. Sfun. Fail 5} =f1{3, 5] g, {1, 2] +fv{3, 5H!\" [1, 2] = 5 X 2 + (2} x 4 = 2, and F43, 5} =f;{3, 5] gun, 2} +f,{3, Slhu, 2] =5 x (l}+ {2) :u: (-3}=