Given a the vector equation $\mathbf{r} (t) = (-3 + 3\!t) \mathbf{i} + (1 + 5\!t) \mathbf{j} +(-3 - 3\!t) \mathbf{k}$, rewrite this in terms of the symmetric equations for the line.

(quotient involving x)
(quotient involving y) =
(quotient involving z) =