Given: Equation of the curve 
……….(i)
= 
= Slope of the tangent at 
But according to question, slope = 
=
or 
From eq. (i), when 
And when 
Points of contact are (2, 1) and 
And Equation of two tangents are 
= 
and
= 
Find the equation of all lines having slope – 1 that are tangents to the curve y= 1 /(1-x) , x ≠ 1.
Find the equation of all lines having slope – 1 that are tangents to the curve y= 1 /(1-x) , x ≠ 1.