Posted by **ashley** on Saturday, July 14, 2012 at 9:35pm.

Triangle ΔABC has vertices A(2,5), B(8,1) and C(-2,-1) and is a right triangle. If the slope of AB is -2/3 and the slope of AC is 3/2, are the lines parallel, perpendicular or neither?

- math -
**ashley**, Saturday, July 14, 2012 at 9:35pm
i was thinking neither..im not sure though

- math -
**Reiny**, Saturday, July 14, 2012 at 10:43pm
If two lines are perpendicular, then their slopes are negative reciprocals of each other, or another way of looking at it, when their slopes are multiplied the result is -1

Is (-2/3)(3/2) = -1 ???

- math -
**ashley**, Sunday, July 15, 2012 at 2:00pm
yes

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