6 The equation of a curve is [ x ln y=2 x+1 . ] (i) Show that ( frac{mathrm{d} y}{mathrm{~d} x}=-frac{y}{x^{2}} ). (ii) Find the equation of the tangent to the curve at the point where ( y=1 ), giving your answer in the form ( a x+b y+c=0 ).
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