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2015-10-25T19:51:41+05:30
If three points are collinear, then slope of line joining any two points is equal to slope of line joining other two points. Ans: x=2 Slope of line joining (x,-1) and (4,5) = slope of line joining (2,-1) and (4,5)_____________________ (x-4)/(-1-5)=(2-4)/(-1-5)____________________ On solving, x=2
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