$y = mx + \frac{2}{m}$ is the general solution of

  • A
    $y\left(\frac{dy}{dx}\right)^{2} = x\left(\frac{dy}{dx}\right) + 2$
  • B
    $y = x \frac{dy}{dx} + 2$
  • C
    $y\left(\frac{dy}{dx}\right) = x\left(\frac{dy}{dx}\right)^{2} + 2$
  • D
    $y\left(\frac{dy}{dx}\right) = x + 2$

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Form the differential equation of the family of circles in the first quadrant which touch the coordinate axes.

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The differential equation for which $l x^2+m y^2=x+y$ is the general solution is

Statement $I$: The differential equation corresponding to the family of circles having their centres on $Y$-axis and fixed radius $k$ is $(x^2-k^2)(\frac{dy}{dx})^2+x^2=0$.
Statement $II$: The differential equation corresponding to the family of circles passing through the origin and having their centres on $X$-axis is $x^2-y^2+2xy \frac{dy}{dx}=0$.
Which of the above statements is (are) true?

The differential equation of all parabolas whose axis is the $y$-axis is:

The differential equation of all parabolas whose axes are parallel to the $Y$-axis is:

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