Using Vectors ,prove that the points ( 2, -1 , 3 ) , ( 3, -5 , 1 ) and ( -1 , 11 , 9 ) are collinear.
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for all these points to be collinear, they should lie in the same straight line
that is should have same slopes
slope=y2-y1/ x2-x1
slope1 = -5-(-1)/3-2 = -4
slope2= 11-(-5)/ -1-3 = -4
slpoe3= 11-(-1)/ -1-2= -4
all of them have the same slopes
Therefore they are collinear
thank u