# Calc III

## Homework Statement

Find a unit vector that is parallel to the vector from )5,1,-3) to (2,1,1)

## The Attempt at a Solution

I will appreciate any HINT for this problem b/c I am totaly confused from the why how the question is stated. Please help.

First find a vector that goes between those 2 points

Well, you know what the direction of the vector is, you just have to scale it correctly...

Well, you know what the direction of the vector is, you just have to scale it correctly...

I don't think I get this that I have to scale it correctly...

Well, you know what the direction of the vector is, you just have to scale it correctly...

I don't think I get this that I have to scale it correctly...

What's the difference between any old vector and unit vector?

okay, I am following the textbook and nothings helps.

The points (5,1,-3) and (2,1,1) are the points of the vector V=<-3,0,4>

Then ||v||= 5
u= v/||v||= 1/5<-3,0,4>
Two nonzero vectors u avd v are parallel if there is some scalar c
such that
u=c.v

Am I even close with this solution? I am getting more confused.

Mark44
Mentor
That's the vector you want.

Thank you.