Question

The equation $a{x}^2+b{y}^2+cx+cy-0,c\ne 0$represents a pair of st. lines if

• A. a + b=0
• B. b + c = 0
• C. c + a=0
• D. a + b + c = 0

Answer 1

Answer: (A)

Correct answer is (a) a + b=0