Is there any way to get the X and Y bar symbol with keyboard commands (Y with a line over it)

[John]

Hi,

I'm trying to write the equation in Word a = Y - bX. where the Y represents
the mean of my Y values and the X the mean of my X values. In order to do
this properly, I would have to have a straight line over the X and Y. IS
there any way to do that, whether it be by a keyboard command, character
map, somethig in Word, etc. Also, I need to put the ^, or hat, above a
variable in another equation. Any suggestions?

J