71.8.3 problem 3 (a)

Internal problem ID [14437]
Book : Ordinary Differential Equations by Charles E. Roberts, Jr. CRC Press. 2010
Section : Chapter 2. The Initial Value Problem. Exercises 2.4.4, page 115
Problem number : 3 (a)
Date solved : Tuesday, January 28, 2025 at 06:31:04 AM
CAS classification : [_separable]

\begin{align*} y^{\prime }&=\frac {y}{x} \end{align*}

With initial conditions

\begin{align*} y \left (-1\right )&=1 \end{align*}

✓ Solution by Maple

Time used: 0.004 (sec). Leaf size: 7

dsolve([diff(y(x),x)=y(x)/x,y(-1) = 1],y(x), singsol=all)
 

\[ y = -x \]

✓ Solution by Mathematica

Time used: 0.022 (sec). Leaf size: 8

DSolve[{D[y[x],x]==y[x]/x,{y[-1]==1}},y[x],x,IncludeSingularSolutions -> True]
 

\[ y(x)\to -x \]