Question 1196826
SLOPES of every pair of points - exactly two pair of points will have slopes which are negative reciprocals.




{{{(5+1)/(5-2)=6/3=2}}};

{{{(-3-5)/(6-5)=-8}}};

{{{(-3+1)/(6-2)=-2/4=-1/2}}}


Yes.  The point (2,-1) is the vertex with the right-angle.


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YOU WISH TO VERIFY THAT THE THREE POINTS FORM A RIGHT TRIANGLE.
YOU FIND BY SLOPE CALCULATION THAT  {{{2*(-1/2)=-1}}} FOR TWO OF THE PAIR OF POINTS----THAT IS YOUR VERIFICATION.