3. using the vectors, show that the points
A. (-2,1), B (-5,-1) and C(1,3) are collinear.
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answer:
A= -2i+j
B= -5i-j
C= I+3j
AB = B-A =-3i-2j = -(3i+2j)
BC =C-B =6i+4j = 2(3i+2j)
CA=A-C=-3i-2j= -(3i+2j)
therefore collinear
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