Posted by **Katie A** on Thursday, September 29, 2011 at 9:51pm.

Are these lines parallel, or perpendicular

2x+4y=4

4x-2y=1

I think they are niether

- algebra -
**Reiny**, Thursday, September 29, 2011 at 10:16pm
slope of first = -1/2

slope of second = 2

Do you want to re-evaluate your decision ?

- algebra -
**Katie A**, Thursday, September 29, 2011 at 10:28pm
so are the perpendicular?

- algebra -
**Reiny**, Thursday, September 29, 2011 at 11:19pm
yes, the slopes are negative reciprocals of each other

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