Which of the following equation is linear? `sqrt(1-x^2)dx+sqrt(1-y^2)dy=0`

Write order and degree (if defined) of each of the following differential equations. sqrt(1-y^(2))dx+sqrt(1-x^(2))dy=0

Find the general solution of the following differential equations : sqrt(1+x^(2))dy+sqrt(1+y^(2))dx=0 .

Solve the following differential equations. sqrt(1+x^(2))dx +sqrt(1+y^(2))dy=0

Solve the following differntial equations: sqrt(1+x^2)dy+sqrt(1+y^2)dx=0 .

Solve the following differential equation: x\ sqrt(1-y^2)dx+y\ sqrt(1-x^2)\ dy=0

Solve the following differential equation: x sqrt(1-y^(2))dx+y sqrt(1-x)dy=0

Solve the differential equation : y sqrt(1-x^2)dy - sqrt(1+y^2)dx = 0

Solve the differential equation : y sqrt(1-x^2)dy-sqrt(1+y^2)dx =0

Find the order the degree, if defined, of the following differential equation and state whether they are linear or non-linear : sqrt(1-x^(2))dx+sqrt(1-y^(2))dy=0 .