Solution: Let F(x, y)=x? e^y+y？ - 1=0

So dy/dx=- (? F/？ x)/(？ F/？ y)=-(2xe^y)/(x？ e^y+2y)

If the derivative of point (1, 0) is found, there is (dy/dx) ∣ (1, 0) =-2;