Question
Question: A circle passes through the points of intersection of lines x + y = 1 and x + ly – 3 = 0 with co-or...
A circle passes through the points of intersection of lines
x + y = 1 and x + ly – 3 = 0 with co-ordinate axis. Then
A
l = –1
B
l = 1
C
l = 2
D
l = –2
Answer
l = 1
Explanation
Solution
A,B,C,D are concyclic
Ю OA.OD = OB.OC