54-59. Tangent planes Find an equation of the plane tangent to the following surfaces at the given points. 54. z2x + y; (1, 1, 3) and (0, 2, 4) y - 55. x+ +1 4 9 1; (0, 2, 0) and (1, 1, = 2; (3, -2, 1) and (-1, -2, 1) 56. x22x + y + 4y + 3z 57. ex-1=1; (1, 1, 1) and (1,-1,1) - 58. z tanxy = 0; (1, 1, 7/4) and (1, 3, /3) 59. x + y Z = 1; (2, 2, 4) and (10, -1, 9)