SOLUTION: determine whether the lines are perpendicular y=x+4, y=x-4

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Question 476432: determine whether the lines are perpendicular
y=x+4, y=x-4
Answer by Tatiana_Stebko(1326) About Me  (Show Source):
You can put this solution on YOUR website!
Perpendicular lines are lines whose slopes are negative reciprocals of one another, m%5B1%5D%2Am%5B2%5D=-1
The slope of the line y=x%2B4 is m%5B1%5D=1
The slope of the line y=x-4 is m%5B2%5D=1
Then m%5B1%5D%2Am%5B2%5D=1%2A1=1 not -1
The lines are not perpendicular