For the system {x+2y+z=52x−y+3z=4\begin{cases} x + 2y + z = 5 \\ 2x - y + 3z = 4 \end{cases}{x+2y+z=52x−y+3z=4 with z=2z = 2z=2, what is x+yx + yx+y?
111
75\frac{7}{5}57
222
52\frac{5}{2}25