Vector addition confusion

  • #1
I am stuck on this one:

ZT7emg6.png


According to me, the only correct answers are

[itex]\vec{r} = \vec{t} - \vec{s} \\ \vec{r} + \vec{s} = \vec{t}[/itex]

But according to the key, these are also correct

[itex]\vec{r} + \vec{t} = \vec{s} \\ \vec{s} + \vec{t} = \vec{r} [/itex]

I honestly do not see how, can somebody please explain?
 

Answers and Replies

  • #2
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But according to the key, these are also correct

[itex]\vec{r} + \vec{t} = \vec{s} \\ \vec{s} + \vec{t} = \vec{r} [/itex]
Those are wrong, unless you have some special, weird vector spaces.
 
  • #3
CompuChip
Science Advisor
Homework Helper
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However it does look like t - r = s.
 
  • #4
34,800
10,960
That is another valid equation. t=r+s, r=t-s and s=t-r are equivalent.
 
  • #5
Thanks.
 

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