anonymous
  • anonymous
let v=(2, 8) and w=(-1, -4) which of the following is true? A) The x-component of v is 2 B) v and w are perpendicular C) v*w=-34 D)v=-2w (Check all that apply)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jhonyy9
  • jhonyy9
than you know that the coordinats of a point p you write in form of p=(x,y) - so you see that for point v these coordnates are x= ? and y= ? than how you think what is true ?
anonymous
  • anonymous
@graciecohen what is the dot product of those two vectors?
anonymous
  • anonymous
I have no idea of the answers and this is all they gave me

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anonymous
  • anonymous
are you familiar with what a dot product is?
anonymous
  • anonymous
the dot product is -34 I think
anonymous
  • anonymous
yes thats correct
anonymous
  • anonymous
so assuming v*w means the dot product of v and w then you know that choice c is correct
anonymous
  • anonymous
looking at what @jhonyy9 wrote , can you tell if A is true or false?
anonymous
  • anonymous
true?
anonymous
  • anonymous
yep, so you know a and c are both true, lets look at b
anonymous
  • anonymous
if two vectors are perpendicular what does their dot product equal?
anonymous
  • anonymous
google it if you arent sure
anonymous
  • anonymous
orthogonal is perpendicular by the way
anonymous
  • anonymous
@graciecohen what do you think?
anonymous
  • anonymous
0
anonymous
  • anonymous
so its not perpendicular
anonymous
  • anonymous
correct
anonymous
  • anonymous
so we have a = true, b = false, c = true, what about d?
anonymous
  • anonymous
what is -2w equal to?
anonymous
  • anonymous
d is true
anonymous
  • anonymous
correct
anonymous
  • anonymous
a = true b = false c = true d = true
anonymous
  • anonymous
thank you so much
anonymous
  • anonymous
yw

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