The differential equation of the family of straight lines which are at a distance 3' units from origin is

The differential equation of all straight lines which are at a fixed distance of 10 units from the origin is (y-xy_(1))^(2) = A(1+y_(1)^(2)) then A is equal to ________.

The differential equation of all straight lines which are at a fixed distance of 10 units from the origin is (y-xy_(1))^(2) = A(1+y_(1)^(2)) then A is equal to ________.

Find the differential equation of the family of all straight lines.

Which one of the following differential equations represents the family of straight lines which are at unit distance from the origin ?

The differential equation of the family of straight lines parallel to x-axis is ____.

Find the differential equation of all straight lines, which are at a unit distance from origin.

The equation of set of lines which are at a constant distance 2 units from the origin is