Two lines a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 are parallel if
A. n/(n+1)
B. 1/(n+1)
C. 1/n
D. None of these
Answer:A
Two lines a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 are parallel if
A. n/(n+1) B. 1/(n+1) C. 1/n D. None of these