when 2 vectors are parallel what we have ?
I mean vector AB//BC= ?

Question

amistre64 · Answer

we have 2 vectors the differ by at most a scalar

anonymous · Answer

AB*BC=0 ?

amistre64 · Answer

does dotting parallel vectors produce a 0?  they aint orthogonal that I can recall

amistre64 · Answer

0,1
0,1
----
0+1 = 1

0,1
0,-1
----
0-1 = -1

amistre64 · Answer

3 , 4
-3,-4
-----
-9-12 = -18

anonymous · Answer

AB+BC=-1 ?

amistre64 · Answer

adding vectors produces another vector, not a scalar

amistre64 · Answer

youre gonna have to provide more verbiage if I am to understand what it is your asking :)

amistre64 · Answer

that and 4.-4 = -16 ... not -12 lol

anonymous · Answer

I have the vectors AB(2,6) and BC(2K-2 , 5K-4)
And I need to prove that those vectors are parallel. How I will do that?

anonymous · Answer

I mean,I need to find fot wich k those vectors are parallel.

amistre64 · Answer

when they differ by only a scalar; by a multiplicative factor.

2 = 2k-2

  and

6 = 5k-4

anonymous · Answer

You could test values of k--

amistre64 · Answer

4 = 2k; k=2

10 = 5k; k=2

right?  so when k=2; that is one possible option for parallel

anonymous · Answer

then we have AB//BC <=> AB = BC

amistre64 · Answer

when ab = bc; they are parallel; but thats not the only case ...

amistre64 · Answer

if you can determine the angle that the vectors span from each other; then you can prove if they are parallel or not as well :)

180 and 0 are parallel vectors

anonymous · Answer

normal to one is normal to the other...

anonymous · Answer

okay,I got it :D
Thank ya a lot.

amistre64 · Answer

2  ,     6
2k-2, 5k-4
-----------
4k-4 + 30k-24 = 34k -28 ..... :)