0010.tex

\begin{exerciseStatement}


 Apply each of the substitutions \(u=\frac{y}{t}\) and \(u=at+by+c\) to one of the following ODEs, and show that each result is separable. (Do not fully solve either ODE.) 


\begin{enumerate}[(a)]
\item \( t y {y'} - 4 \, t^{2} + y^{2} = 0 \)
\item \( y - \frac{4}{4 \, t - y + 5} - 9 = 4 \, t + {y'} \)
\end{enumerate}
    
\end{exerciseStatement}
    
\begin{exerciseAnswer} 

\begin{enumerate}[(a)]
\item \( \frac{u {u'}}{u^{2} - 4} = \frac{1}{t} \)
\item \( \frac{u {u'}}{u^{2} + 4} = 1 \)
\end{enumerate}
    
\end{exerciseAnswer}