Question:
There exist constants $p$ and $q$ so that for any vectors $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{c},$ the vectors $\mathbf{a} - 2 \mathbf{b} + 3 \mathbf{c},$ $2 \mathbf{a} + 3 \mathbf{b} - 4 \mathbf{c},$ and $p \mathbf{b} + q \mathbf{c}$ are always collinear.  Enter the ordered pair $(p,q).$

Answer:
The line through $\mathbf{a} - 2 \mathbf{b} + 3 \mathbf{c}$ and $2 \mathbf{a} + 3 \mathbf{b} - 4 \mathbf{c}$ can be parameterized by
\begin{align*}
&\mathbf{a} - 2 \mathbf{b} + 3 \mathbf{c} + t((2 \mathbf{a} + 3 \mathbf{b} - 4 \mathbf{c}) - (\mathbf{a} - 2 \mathbf{b} + 3 \mathbf{c})) \\
&= (1 + t) \mathbf{a} + (-2 + 5t) \mathbf{b} + (3 - 7t) \mathbf{c}.
\end{align*}To get an expression of the form $p \mathbf{b} + q \mathbf{c},$ we want the coefficient of $\mathbf{a}$ to be 0.  Thus, we take $t = -1,$ which gives us $-7 \mathbf{b} + 10 \mathbf{c}.$  Hence, $(p,q) = \boxed{(-7,10)}.$