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 $D'$
- $A(1, 3) , B(4, 0) , C(6, 2)$
I really don't know how to find the Cartesian equation of $D$ knowing that:
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