Question

If two vectors 2i +3j - k and - 4 - 6j - ak are
parallel to each other then value of a be
(a) 0
(b) 2
(C) 3
(d) 4​

Answer 1

since they are parallel to each other

So, they are scalar multiples of one another

here we can notice

that ,

A = 2i +3j - k

B = - 4i - 6j - ak

I.e

2A = B

there fore value of a will be 2

(b) is your answer