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- 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)

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- anonymous

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- 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

@graciecohen what is the dot product of those two vectors?

- anonymous

I have no idea of the answers and this is all they gave me

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- anonymous

are you familiar with what a dot product is?

- anonymous

the dot product is -34 I think

- anonymous

yes thats correct

- anonymous

so assuming v*w means the dot product of v and w then you know that choice c is correct

- anonymous

looking at what @jhonyy9 wrote , can you tell if A is true or false?

- anonymous

true?

- anonymous

yep, so you know a and c are both true, lets look at b

- anonymous

if two vectors are perpendicular what does their dot product equal?

- anonymous

google it if you arent sure

- anonymous

orthogonal is perpendicular by the way

- anonymous

@graciecohen what do you think?

- anonymous

0

- anonymous

so its not perpendicular

- anonymous

correct

- anonymous

so we have a = true, b = false, c = true, what about d?

- anonymous

what is -2w equal to?

- anonymous

d is true

- anonymous

correct

- anonymous

a = true
b = false
c = true
d = true

- anonymous

thank you so much

- anonymous

yw

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