Question 832853
You have to imagine that you are on a vertical
line, and you can move up or down but you 
have to stay on the vertical line.
Whenever you move, you check your
(x,y) which defines your location on the
x-y plane.
You notice that x never changes, no matter
what y is.
Going back to
B. {{{ 3x - 2 = 0 }}}
{{{ 3x = 2 }}}
{{{ x = 2/3 }}}
This says " I don't care what y is, I alway want
x to be 2/3."  This is the same situation.
It is the vertical line {{{ x = 2/3 }}}