solve this system by sustituting$\displaystyle t=e^u$ and building a function $\displaystyle y(u)=x(e^u)$

$\displaystyle

t\frac{dx}{dt}=(\begin{array}{cc}

2 & 2\\

1 & 3\end{array})x

$

$\displaystyle

x(1)=(\begin{array}{c}

2\\

3\end{array})

$

how to do it?