Question

Lines x = ay + b, z = cy + d and x = a'y + b', z = c'y + d' are perpendicular, if रेखाएँ x = ay + b, z = cy + d और x = a'y + b', z = c'y + d' लम्बवत् होगी, यदि

• A. aa' + cc' + 1 = 0
• B. aa' + cc' - 1 = 0
• C. ac + a'c' - 1 = 0
• D. ac + a'c' + 1 = 0

Answer 1

Answer: (A)