# Vector direction determination

## Homework Statement

If z = east and y = south, then x = ______?
Select one:
a. east
b. up
c. south
d. north
e. down

## The Attempt at a Solution

using the right hand rule the answer i got is south is this correct?

jedishrfu
Mentor
that cant be right because y is already south

you know z=east so that -z=west and y=south so that -y=north so what else is left for x?

that cant be right because y is already south

you know z=east so that -z=west and y=south so that -y=north so what else is left for x?

really sorry i meant up is that correct?

Chestermiller
Mentor
really sorry i meant up is that correct?
Yes. Rotating y into z gives x for your thumb.