Find an equation of the tangent plane to the given surface at the specified point. 
Definitions:
Negative Correlation
A connection between two factors where as one factor rises, the other falls.
Variable
Any condition or factor that can be manipulated, controlled, or measured.
Research Method
Various techniques and strategies used by scientists to gather and analyze data in order to investigate specific questions or hypotheses.
Independent Variables
In research, the variable that is manipulated or changed by the researcher to observe how it affects the dependent variable.
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