12. [-/2 Points] DETAILS SCALCET9 14.5.011. MY NOTE Use the chain rule to find - and az as at Z = (x- y) , x= s't, y= st2 az as az at Need Help? Read It Submit Answer 13. [-/2 Points] DETAILS SCALCET9 14.5.018. MY NOTE Let R(s, t) = G(u(s, t), v(s, t)), where G, u, and v are differentiable, and the follow U( - 7, 3) = 8 v( - 7, 3) = -8 Us (-7, 3 ) = -2 Vs ( - 7, 3 ) = -3 U. (- 7, 3 ) = 6 V- ( - 7, 3 ) = 2 G (8, -8) = -1 G (8, -8) = 1 Find R (-7, 3) and R. (-7, 3). R ( - 7 , 3 ) = R. ( - 7 , 3 ) = Need Help? Read It Submit Answer 14. [-/2 Points] DETAILS SCALCET9 14.5.035. MY NOTE Use the equations OF OF az ax ay and az = ax ay OF az az to find dz and Oz ax ay x2 + 8y2+ 722 = 1 dz ax az ay