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## Homework Statement

Find the slope of tangent line to curve that is intersection to the surface z= (x^2) - (y^2) with plane x =2 , at point (2,1,3)

The ans given by the author is only∂z /∂y = -2

## Homework Equations

## The Attempt at a Solution

Is my diagram correct ?

I'm wondering , why shouldnt we move the entire graph 'forward ' to x = 2 ? [/B]