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If the pairs of lines  and  have exactly one line in common, then the joint equation of the other two lines is given by

a)

b)

c)

d)



Question ID - 52928 | SaraNextGen Top Answer

If the pairs of lines  and  have exactly one line in common, then the joint equation of the other two lines is given by

a)

b)

c)

d)

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Let  be a line common to the given pairs of lines. Then

 and

  and 

 or

But for , the two pairs have both the lines common. So  and the slope  of the line common to both the pairs is 1. Now,

and

so the equation of the required lines is

127 votes


127