Posted by Allyson on Sunday, December 5, 2010 at 3:34pm.
I'll help.
Lines a and c are parallel. For lines to be parallel, their slope must be equal. These 2 lines both have slopes of 4. Line b is perpendicular to the others, because it's slope, -1/4, is the opposite (in terms of sign) reciprocal of 4 (which is positive, -1/4 is negative). I hope this helped. Peace out.
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