The following system has an infinite number of solutions. Write the solution in terms of $y$ and $z$. $$\begin{array}{rcrcrcrcr} 2 w & - & x & + & 1 y & - & z & = & 3 \\ w & + & x & - & y & + & 4 z & = & 1 \\ 3 w & & & + & 0 y & + & 3 z & = & 4 \\ 3 w & - & 3 x & + & 3 y & - & 6 z & = & 5 \end{array}$$ $w$ =
$x$ =