Answers
Equation of the tangent plane for any Surface S by S1=0 (substituting one time)
Equation of the tangent plane is 
Normal Line is Perpendicular to the tangent plane(coefficents as dr's) and passing through the given point
Eqution of Normal line is 
We were unable to transcribe this image
42 +91-9 = 0
We were unable to transcribe this image
6 - I 2 - 9 Y = 9 -4
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