1. Consider the ODE system y' (t) = - (²₂2) Y. y. 0 (a) Why doesn't our usual method (find the eigenvalue-eigenvector pairs and build the general solution y(t) = c₁etvt + c₂ed2tv₂) work in this case? (b) Find the general solution of the system by back-substitution: solve the second equa- tion for y2(t) first, then plug y2 (t) into the y₁ equation to get a solvable scalar ODE. This method only works for systems where the matrix is triangular.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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1. Consider the ODE system
y' (t) = - (²₂2) Y.
y.
(a) Why doesn't our usual method (find the eigenvalue-eigenvector pairs and build the
general solution y(t) = c₁etvt + c₂ed2tv2) work in this case?
(b) Find the general solution of the system by back-substitution: solve the second equa-
tion for y2 (t) first, then plug y2 (t) into the y₁ equation to get a solvable scalar ODE.
This method only works for systems where the matrix is triangular.
Transcribed Image Text:1. Consider the ODE system y' (t) = - (²₂2) Y. y. (a) Why doesn't our usual method (find the eigenvalue-eigenvector pairs and build the general solution y(t) = c₁etvt + c₂ed2tv2) work in this case? (b) Find the general solution of the system by back-substitution: solve the second equa- tion for y2 (t) first, then plug y2 (t) into the y₁ equation to get a solvable scalar ODE. This method only works for systems where the matrix is triangular.
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