Question

Which of the following vectors are orthogonal to (2,1)?

A. (1,2)
B. (-3,6)
C. (-2,-3)
D. (1,-2)

Answer 1

@ganeshie8

Answer 2

@jamesr

Answer 3

@dan815

Answer 4

YOLO

Answer 5

-.-

Answer 6

yess

Answer 7

I need help

Answer 8

ight whts up

Answer 9

Is it B and D then

Answer 10

Do you remember the condition to be orthogonal?

Answer 11

I.E. the dot product.

Answer 12

aww ship i got to catch up

Answer 13

Yes but is B and D

Answer 14

i say its D

Answer 15

It was right thanks though

Answer 16

what, D

Answer 17

\[\vec{a}^{\,}\cdot\vec{b}^{\,}=0 \rightarrow \sum_{1}^{i}a_{i}b_{i} = 0\] This is what you need to use.

Answer 18

hey orthogonal means these vectors are at 90 degree angle

Answer 19

othogonal or perpendicular

Answer 20

the slope for the vector given <2,1> Slope= 1/2 =
and a perpendicular slope to that would be 2/-1 =-2 which is the "negative reciprocal" of 1/2

we can see the slopes of each vectors given see which of those simplify to -2 slope


A)(1,2) slope = 2/1=2
B. (-3,6) Slope=6/-3=2/-1=-2 <--------
C. (-2,-3) Slope= -3/-2=3/2
D. (1,-2) Slope=-2/1 =-2 <------------

So you are right