SOLUTION: is y=2/3x-3 perpedicular parrallel or neither to 18x+12y=-3

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Question 876427: is y=2/3x-3 perpedicular parrallel or neither to 18x+12y=-3
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
y=%282%2F3%29x-3 has a slope of 2%2F3 .
18x%2B12y=-3<-->12y=-18x-3<-->y=%28-18x-3%29%2F12<-->y=%28-18%2F12%29x-3%2F12<-->y=%28-3%2F2%29x-1%2F4 has a slope of -3%2F2 .
The product of the slopes is
%282%2F3%29%28-3%2F2%29=-1 so the lines are perpendicular.