Answers

2014-06-11T20:39:02+05:30
Let mark the points as:
A(2,-2), B(-3,8), B(-1,4)
The distance between the points are as follows
AB=(-3-2)+(8+2)=5
BC=(-1+3)+(4-8)=2
AC=(-1-2)+(4+2)=3
If the point should be collinear the sum of difference of two point is equal to the third one,
therefore,BC+AC=AB,2+3=5
therefore points are collinear
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2014-06-11T20:52:00+05:30
If three points are collinear then they lie in a line
equation of line passing through (2,-2)&(-3,8)
y+2 = -2(x-2)
2x + y = 2
if third point lie on this line then point must satisfy this line
-2+4 = 2
2 = 2
hence points are collinear
 

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