Question

show that point A(2,3) ,B(5,6) and C(0,1) are collinear

Answer 1

slopeAB=6-3/5-2
=3/3
=1
slope of BC=1-6/0-5
=-5/-5
=1
yes the points are colinear
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Answer 2

first find AB=√(5-2)² +(6-3)²
√9+9=√18
after BC=√(0-5)² +(1-6)²
√25+25
√50
at last find CA=√(2-0)²+(3-1)²
√4+4=√8