\begin{tabular}{|l|l|}
\hline & \begin{tabular}{l}
The system has no solution. \\
The system has a unique solution: \\
$(x, y)=(\square, \square)$ \\
System A \\
$2 x-y=6$
\end{tabular} \\
The system has infinitely many solutions. \\
They must satisfy the following equation: \\
$y=6$
\end{tabular}

Answer

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Answer

Final Answer: $\boxed{(6, 6)}$

Steps

Step 1 ：The system of equations given is System A: $2x - y = 6$ and $y = 6$.

Step 2 ：To find the solution to this system, we can substitute $y = 6$ into the first equation and solve for $x$.

Step 3 ：Substituting $y = 6$ into the first equation gives us $2x - 6 = 6$.

Step 4 ：Solving this equation gives us the solution $x = 6$.

Step 5 ：Therefore, the solution to the system of equations is $(x, y) = (6, 6)$.

Step 6 ：Final Answer: $\boxed{(6, 6)}$