Use the substitution v=y' to write each second-order equation as a system of two first-order differential equations (planar system). y''+2y'-3y=0

Dottie Parra

Dottie Parra

Answered question

2021-05-23

Use the substitution v=y to write each second-order equation as a system of two first-order differential equations (planar system). y+2y3y=0

Answer & Explanation

Ezra Herbert

Ezra Herbert

Skilled2021-05-24Added 99 answers

Let our equation be:
d2ydx2+2dydx3y=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
dvdx+2v3y=0
dydx=v
dvdx=3y2v
We got system of first order differential equations which solution is equivalent to solution our second order differential equation.
dydx=v
F(x,v,y)=3y2y

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