Question

If a, b, c are in A.P, then ax + by + c = 0 represents

• A. A single line
• B. A family of concurrent lines
• C. A family of parallel lines
• D. None of these

Answer 1

Answer: (B)

A family of concurrent lines

Answer 2

Since a, b, c are in A.P. ⇒ 2b = a + c

⇒ a – 2b + c = 0 ⇒ family of lines concurrent at the point (1, -2)