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Evaluate the limit. x+ y - 3 lim (x,y) -(3,6) X+y- 9 .. . Select the correct choice below and, if necessary, fill in the answer box to complete your choice. Vx+y - 3 O A. lim = (x,y) -(3,6) X+y-9 (Simplify your answer.) O B. The limit does not exist.dy Given the equation y In (x* + y~ + 7 ) =8, evaluate Assume that the equation implicitly defines y as a differentiable dx function of x. dy dx