eliminasi dengan aligned

\[
    \frac
    {
        \!\begin{aligned}
                2x+3y &= 101.500\\
                2x+4y &= 107.000
        \end{aligned}
    }
    {\!\begin{aligned}
   -y &= -5.500\\
   y &= 5.500
    \end{aligned}
    }
    \ -
\]