SOLUTION: Is y = (-1/3)x - 5 y = 3x - 13 parallel, perpendicular or neither?

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Question 537507: Is y = (-1/3)x - 5 y = 3x - 13 parallel, perpendicular or neither?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
y = (-1/3)x - 5
slope m1 = (-1/3)

y = 3x - 13
slope m2=3
(-1/3)*3= -1
m1*m2=-1
So the lines are perpendicular