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algebra

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Are the following lines parallel, perpindicular, or neither?
(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

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