SOLUTION: determine whether the graphs of each pair of equations are parallel, perpendicular, or neither. y= 5x-4 and y= -5x+4

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Question 231277: determine whether the graphs of each pair of equations are parallel, perpendicular, or neither. y= 5x-4 and y= -5x+4
Answer by texttutoring(324) About Me  (Show Source):
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They are not parallel, because one is positive and the other is negative.
They are not perpendicular, because perpendicular lines have slopes which are negative reciprocals of each other. (i.e. 5/1 and -1/5 are negative reciprocals)
Therefore, those 2 lines are neither parallel nor perpendicular.