Mathematics

Problem

If A(1,2), B(4,5) and C(7,8) are three distinct points in the coordinate plane, which one of the following conditions is sufficient to ensure that A, B and C are collinear? a)

m_{AB}\,\times\,m_{BC}=-1

|m_{AB}|=|m_{BC}|

m_{AB}=m_{BC}

m_{AB}=-\,m_{BC}

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