"If dependent variable (y) and its derivative (differential coefficient) both are of first degree, then differential equation is of first order."
General form of first order differential equation
\(\frac{dy}{dx}\) + Py = Q ...(1)
where P and Q are constants or functions of x.
For example:
etc. are linear equations.
Remark: Second form of first order linear equation is \(\frac{dy}{dx}\) + P1x = Q1 where P1 and Q1 are either constant or functions of y.
For example :
