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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 -

    i was thinking neither..im not sure though

  • math -

    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 -

    yes

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