Finding the equation of the tangent plane to a level surface

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So the fact that the level surface is equal to a constant 7 is irrelevant? For example, if the level surface was 2 or 9 doesn't make a difference.

alaner
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Sir, I got a question for question b. Are we allow to say 3x+2y-2z=14 is the same equation of 2x+3y-z-7=0?

shanghaireminiscence