Use the substitution v=y' to write each second-order equation as a system of two first-order differential equations (planar system). 4y''+4y'+y=0

Dottie Parra

Dottie Parra

Answered question

2021-05-12

Use the substitution v=y to write each second-order equation as a system of two first-order differential equations (planar system). 4y+4y+y=0

Answer & Explanation

d2saint0

d2saint0

Skilled2021-05-13Added 89 answers

Let our equation be:
4d2ydx2+4dydx+y=0
Our task is to write our second order differential equation as a system of two first order differential equations. Let's introduce a substitution dydx=v and we get:
dydx=v
4dvdx+4v+y=0
dydx=v
dvdx=14yv
We got system of first order differential equation which solution is equivalent to solution our second order differential equation.
dydx=v
F(x,v,y)=14yv

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