Simple linear algebra question (test in a few hours)

[Physics_wiz]

my book says that if you have a parametrized line in 3 dimensions
i.e.:
x - 1 = 4t
y - 5 = 3t
z - 2 = 7t,

the vector <4, 3, 7> (coefficients of t) is a vector parallel to that line.

My notes clearely say that the vector <4, 3, 7> is a normal vector to the parametrized line.

Which one is right?

Thanks.

 

[harsh]

It should be parallel.

- harsh

 

[Physics_wiz]

Ok thanks. That's what I thought...I should drink some caffiene before I go to class and take notes.