Mathematics Differential Equations Formation of a Differential Equation

The differential equation of system of concentric circles with centre (1, 2) is - 

1
\(\rm (x-2)+(y-1) \dfrac{dy}{dx}=0\)
2
\(\rm (x-1)+(y-2) \dfrac{dy}{dx}=0\)
3
\(\rm (x-1) \dfrac{dy}{dx}+(y-2)=0\)
4
\(\rm (x-2) \dfrac{dy}{dx}+(y-1)=0\)

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