8) Find all points on the curve C = {(LE,y) : $2 my + y2 = 7} whore the tangent line to C is parallel to the line with equation 3,: = 3.1.- 1. 9) Explain why the surface with given equation has a tangent plane at (a, b, c), and nd an equation for this plane. (c) c03(7r:1:) $251 + a" + yz = 4; ((1, inc) = (0,1,2) 1) Determine the local minima and maxima of the given function f. (b) f(-T='y) = 333 - 3$y+y3, (117,306 1R2 (8) my) = my+ 51, + 5, (:17,y)7(030)