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(Please note that the following article is one of my old math papers) Differential equations are used in many areas of engineering, especially for modeling the behavior of various physical processes. It is difficult to solve these equations but they can be solved by integrating them. This article discusses some properties of differential equations with an emphasis on linear first order differential equation models which are amenable to numerical analysis. This article is not meant for students who are just starting their study of differential equations, but rather for students who have studied basic concepts of differential equations and wish to know more. A differential equation is an equation involving differentiation of one or more unknown functions with respect to any or all of its arguments. For each function in the equation the derivative of the function is also specified. Differential equations can be linear, nonlinear, homogeneous, inhomogeneous etc... Differential equations serve as fundamental models for various physical phenomena including heat flow, musical instruments vibration systems etc. which occur in nature.. Differential equations are important in engineering because they can be used to solve real life problems. Physical phenomena which occur in nature are often modeled by differential equations, and these equations can be solved by relating them to computer models. Single-variable linear first-order differential equation is an equation of the form where is an unknown function, formula_2 is a constant displacement, formula_3 is the first time derivative of , formula_4 are known functions for some constant . The right hand side of the above equation has to be zero for all values of and . This equation indicates that acceleration changes linearly with displacement and this relationship must hold true at all times. This is a linear differential equation in one variable. A differential equation is a system of second order linear equations if the matrix which represents it satisfies certain conditions, that is given by where formula_6 are differential operators whose coefficients are determined by the initial conditions. This matrix representation of the original function reduces to an ordinary matrix representation after integration over time. An equation can be expressed in matrix form using different ways depending on its form. Differential equations can be represented by exaplicit formulae where all functions involved are found through mathematical operations or algebraic manipulations, so called implicit formulae. For example, given the following differential equation: where . and and and and and and and and . Then, derivative of with respect to is: Numerous techniques have been developed to solve differential equations. The solution of differential equations can be achieved using series expansions, Laplace transform, trigonometric methods, integration by parts method etc. Differential equations of nonlinear form can be solved numerically by Runge-Kutta or Gear's method.First order differential equations are widely used in areas such as physics, acoustics, engineering etc.The following table summarizes the behavior of the solutions for the given values of . cfa1e77820