SOLUTION: determine it the lines are parallel, perpendicular or neither -x+3y=11 3x+y=12

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Question 836215: determine it the lines are parallel, perpendicular or neither
-x+3y=11
3x+y=12
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
They are not parallel since they intersect at x = 5/2, y = 9/2
slope of one is -3
slope of -x+3y=11 is 1/3
so they are perpendicular