Are the following lines parallel, perpindicular, or neither?

Question

(a)x-2y=4
(b)2x+y=2

(a)-2y=-x-4
-y=-x/2-2
(b)y=-2x+2

I have that they are perpindicular. My question is this:
is -x/2 the reciprocal of 2x?

yes

Thank You