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Given A(2,7), B(−6,−21) and C(1,3.5). Show that the points A,B and C are collinear.

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Given A(2,7), B(−6,−21) and C(1,3.5). Show that the points A,B and C are collinear.

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AB=KBC

−8  = 7k
−28    24.5k
     k =8/7
AB = 8/7BC
AB//BC
Since B is common ∴ ABC are collinear

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