If $2x+3y = 4$ and $y = 34$, what is the value of $x$?
Substituting $y$, we obtain $2x+3(34) = 4$. Solving for $x$, we obtain:

\begin{align*}
2x+3(34) &= 4\\
\Rightarrow \qquad 2x + 102 &= 4\\
\Rightarrow \qquad 2x &= -98\\
\Rightarrow \qquad x &= \boxed{-49}
\end{align*}