Form the differential equation of the family of circles having centre on y-axis and radius 3 units.

Form the differential equation of family of circles having center at origin.

Form the differential equation of the family of circles touching the y-axis at origin.

Form the differential equation of the family of circles touching the y-axis at origin.

Form the differential equation of the family of circles touching the x-axis at origin.

Form the differential equation of the family of ellipses having foci on y-axis and centre at origin.

Form a differential equation of the family of the curves y^2 =4ax .

Form the differential equation of the family of hyperbolas having foci on x-axis and centre at origin.

Form a differential equation of the family of the curves y^(2)=4ax

Form the differential equation of family of lines concurrent at the origin.

Form the differential equation of the family of parabolas having vertex at origin and axis along positive y-axis.