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

Find the differential equation of all straight lines y = mx

If the differential equation of all straigh lines which are at a fixed distance of 10 units from origin is (y-xy_(1))^(2)=A(1+(y_(1))^(2)) then sqrt(A-19)=

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 ________.

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

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 ?