Need help finding the Cartesian equation of a line

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I really don't know how to find the Cartesian equation of $D$ knowing that:

  • $B$ belongs to $D$
  • $D$ is perpendicular to $D'$
  • $A$ and $C$ belongs to $D'$
  • $A(1, 3) , B(4, 0) , C(6, 2)$