DominiRican1013
  • DominiRican1013
Which of the following vectors are orthogonal to (2,1)? A. (1,2) B. (-3,6) C. (-2,-3) D. (1,-2)
Mathematics
schrodinger
  • schrodinger
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DominiRican1013
  • DominiRican1013
DominiRican1013
  • DominiRican1013
DominiRican1013
  • DominiRican1013

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anonymous
  • anonymous
YOLO
DominiRican1013
  • DominiRican1013
-.-
anonymous
  • anonymous
yess
DominiRican1013
  • DominiRican1013
I need help
anonymous
  • anonymous
ight whts up
DominiRican1013
  • DominiRican1013
Is it B and D then
ChillOut
  • ChillOut
Do you remember the condition to be orthogonal?
ChillOut
  • ChillOut
I.E. the dot product.
anonymous
  • anonymous
aww ship i got to catch up
DominiRican1013
  • DominiRican1013
Yes but is B and D
anonymous
  • anonymous
i say its D
DominiRican1013
  • DominiRican1013
It was right thanks though
anonymous
  • anonymous
what, D
ChillOut
  • ChillOut
\[\vec{a}^{\,}\cdot\vec{b}^{\,}=0 \rightarrow \sum_{1}^{i}a_{i}b_{i} = 0\] This is what you need to use.
dan815
  • dan815
hey orthogonal means these vectors are at 90 degree angle
dan815
  • dan815
othogonal or perpendicular
dan815
  • dan815
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

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