Q. 124.0( 32 Votes )

The pair of lines

Answer :

A pair of lines a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 will be parallel if,



So,


k = 2


OR


Equation x2 – 2x + k = 0 has equal roots.


Discriminant = b2 – 4ac = 0 for equal roots.


(-2)2 – 4 × (-2) × k = 0


4 + 8k = 0



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