Question 741263: show that the pionts A(1,-1), B(4,-2) and C(16,1) are collinear
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website! if the points A( , ), B( , ) and C( ,) are collinear, they will lie in a straight line;
in order to prove the  points to lie on a line, as there exists a  line containing three points and every line has a slope}}}
Hence it will be sufficient to prove that the slope calculated taking  points at a time should be equal.
Slope of line taking points (x1,y1)= (,) and (x2,y2)=(,) is
Slope of line taking points (x1,y1)= (,) and (x2,y2)=(,) is
since  , given points are NOT collinear
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