Question

The ratio in which yz-plane divides the line joining the points A(3, 1, -5) and B(1, 4, -6) is 

(A) -3:1 

(B) 3:1 

(C) -1:3 

(D) 1:3

Answer 1

Answer is (A) -3:1

A ≡ (3, 1, −5) and B ≡ (1, 4, −6).

Therefore,

(3 + λ)/(λ + 1) = 0 ⇒ λ = - 3

Therefore required ratio is −3:1.