The differential equation $x \frac{dy}{dx} = 2y$ represents ....

  • A
    a family of circles with radius $c$.
  • B
    a family of parabolas with vertex at the origin and axis along the positive $Y$-axis.
  • C
    a family of parabolas with vertex at the origin and axis along the $X$-axis.
  • D
    a family of ellipses.

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