44.29.4 problem 2(d)

Internal problem ID [9486]
Book : Differential Equations: Theory, Technique, and Practice by George Simmons, Steven Krantz. McGraw-Hill NY. 2007. 1st Edition.
Section : Chapter 10. Systems of First-Order Equations. Section A. Drill exercises. Page 400
Problem number : 2(d)
Date solved : Tuesday, September 30, 2025 at 06:19:22 PM
CAS classification : system_of_ODEs

\begin{align*} \frac {d}{d t}x \left (t \right )&=5 x \left (t \right )+3 y \left (t \right )\\ \frac {d}{d t}y \left (t \right )&=-6 x \left (t \right )-4 y \left (t \right ) \end{align*}

✓ Maple. Time used: 0.117 (sec). Leaf size: 35

ode:=[diff(x(t),t) = 5*x(t)+3*y(t), diff(y(t),t) = -6*x(t)-4*y(t)]; 
dsolve(ode);
 

\begin{align*} x \left (t \right ) &= c_1 \,{\mathrm e}^{-t}+c_2 \,{\mathrm e}^{2 t} \\ y \left (t \right ) &= -2 c_1 \,{\mathrm e}^{-t}-c_2 \,{\mathrm e}^{2 t} \\ \end{align*}

✓ Mathematica. Time used: 0.002 (sec). Leaf size: 66

ode={D[x[t],t]==5*x[t]+3*y[t],D[y[t],t]==-6*x[t]-4*y[t]}; 
ic={}; 
DSolve[{ode,ic},{x[t],y[t]},t,IncludeSingularSolutions->True]
 

\begin{align*} x(t)&\to e^{-t} \left (c_1 \left (2 e^{3 t}-1\right )+c_2 \left (e^{3 t}-1\right )\right )\\ y(t)&\to e^{-t} \left (-2 c_1 \left (e^{3 t}-1\right )-c_2 \left (e^{3 t}-2\right )\right ) \end{align*}

✓ Sympy. Time used: 0.053 (sec). Leaf size: 31

from sympy import * 
t = symbols("t") 
x = Function("x") 
y = Function("y") 
ode=[Eq(-5*x(t) - 3*y(t) + Derivative(x(t), t),0),Eq(6*x(t) + 4*y(t) + Derivative(y(t), t),0)] 
ics = {} 
dsolve(ode,func=[x(t),y(t)],ics=ics)
 

\[ \left [ x{\left (t \right )} = - \frac {C_{1} e^{- t}}{2} - C_{2} e^{2 t}, \ y{\left (t \right )} = C_{1} e^{- t} + C_{2} e^{2 t}\right ] \]