Find a general solution of the given system.   x′=−4x−5y,  y′=2x+2y Eliminate y and solve the remaining differential equation for x. Choose the correct answer below.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Find a general solution of the given system.
 
x′=−4x−5y,  y′=2x+2y
Eliminate y and solve the remaining differential equation for x. Choose the correct answer below.  
 
 
A.
x(t)=a1etcost+a2etsint
 
B.
x(t)=a1e−tcos2t+a2e−tsin2t
 
C.
x(t)=a1etcos2t+a2etsin2t
 
D.
x(t)=a1e−tcost+a2e−tsint
Now find
y(t)
so that
y(t)
and the solution for
x(t)
found in the previous step are a general solution to the system of differential equations.
 
Use a computer system or graphing calculator to construct a direction field and typical solution curves for the given system.
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