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[" 4.Whe 4Three points "P(h,k),Q(x,y,)" ...

[" 4.Whe 4Three points "P(h,k),Q(x,y,)" and "R(x_(y),y_(2))" lie on a line.Show that "],[qquad (h-x_(1))(y_(2)-y_(1))=(k-y_(1))(x_(2)-x_(2))" ."]

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Three points P(h,k),Q(x_(1),y_(1)) and R(x_(2),y_(2)) lie on a line.Show that quad (h-x_(1))(y_(2)-y_(1))=(k-y_(1))(x_(2)-x_(1))

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