**Question **# Solve each system of equations using substitution method. \begin{array}{l}
5 x+2 y=16 \\
x+8 y=26
\end{array} \begin{array}{l}
c+6 d=7 \\
-c-2 d=-2
\end{array} \begin{array}{l}
8 p+7 q=43 \\
2 p-7=-q
\end{array} \begin{array}{l}
-5 a+b=8 \\
7 a+9 b=-32
\end{array} \begin{array}{l}
-5=2 m+6 n \\
4 m+5 n-18=0
\end{array} \begin{array}{l}
v=2-6 \mathrm{u} \\
9 u+2 v=3
\end{array} \begin{array}{l}
r+2 s=4 \\
3 s+r=1
\end{array} \begin{array}{l}
6 y+5 z=0 \\
3 z=7 y+53
\end{array}