Internal problem ID [12777]
Book: DIFFERENTIAL EQUATIONS by Paul Blanchard, Robert L. Devaney, Glen R. Hall. 4th
edition. Brooks/Cole. Boston, USA. 2012
Section: Chapter 3. Linear Systems. Exercises section 3.2. page 277
Problem number: 14 (c).
ODE order: 1.
ODE degree: 1.
Solve \begin {align*} x^{\prime }\left (t \right )&=4 x \left (t \right )-2 y\\ y^{\prime }&=x \left (t \right )+y \end {align*}
With initial conditions \[ [x \left (0\right ) = -1, y \left (0\right ) = -2] \]
✓ Solution by Maple
Time used: 0.0 (sec). Leaf size: 32
dsolve([diff(x(t),t) = 4*x(t)-2*y(t), diff(y(t),t) = x(t)+y(t), x(0) = -1, y(0) = -2],[x(t), y(t)], singsol=all)
\begin{align*} x \left (t \right ) = 2 \,{\mathrm e}^{3 t}-3 \,{\mathrm e}^{2 t} y \left (t \right ) = {\mathrm e}^{3 t}-3 \,{\mathrm e}^{2 t} \end{align*}
✓ Solution by Mathematica
Time used: 0.006 (sec). Leaf size: 32
DSolve[{x'[t]==4*x[t]-2*y[t],y'[t]==x[t]+y[t]},{x[0]==-1,y[0]==-2},{x[t],y[t]},t,IncludeSingularSolutions -> True]
\begin{align*} x(t)\to e^{2 t} \left (2 e^t-3\right ) y(t)\to e^{2 t} \left (e^t-3\right ) \end{align*}