Internal problem ID [6731]
Book: DIFFERENTIAL EQUATIONS with Boundary Value Problems. DENNIS G. ZILL,
WARREN S. WRIGHT, MICHAEL R. CULLEN. Brooks/Cole. Boston, MA. 2013. 8th
edition.
Section: CHAPTER 8 SYSTEMS OF LINEAR FIRST-ORDER DIFFERENTIAL EQUATIONS.
EXERCISES 8.2. Page 346
Problem number: 5.
ODE order: 1.
ODE degree: 1.
Solve \begin {align*} x^{\prime }\left (t \right )&=10 x \left (t \right )-5 y\\ y^{\prime }&=8 x \left (t \right )-12 y \end {align*}
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 36
dsolve([diff(x(t),t)=10*x(t)-5*y(t),diff(y(t),t)=8*x(t)-12*y(t)],singsol=all)
\begin{align*} x \left (t \right ) &= c_{1} {\mathrm e}^{8 t}+c_{2} {\mathrm e}^{-10 t} \\ y \left (t \right ) &= \frac {2 c_{1} {\mathrm e}^{8 t}}{5}+4 c_{2} {\mathrm e}^{-10 t} \\ \end{align*}
✓ Solution by Mathematica
Time used: 0.003 (sec). Leaf size: 73
DSolve[{x'[t]==10*x[t]-5*y[t],y'[t]==8*x[t]-12*y[t]},{x[t],y[t]},t,IncludeSingularSolutions -> True]
\begin{align*} x(t)\to \frac {1}{18} e^{-10 t} \left (c_1 \left (20 e^{18 t}-2\right )-5 c_2 \left (e^{18 t}-1\right )\right ) \\ y(t)\to \frac {1}{9} e^{-10 t} \left (4 c_1 \left (e^{18 t}-1\right )-c_2 \left (e^{18 t}-10\right )\right ) \\ \end{align*}