The completed table of values is:
\[
\begin{array}{|c|c|}
\hline
x & y \\
\hline
0 & 0 \\
7 & 6 \\
14 & 12 \\
21 & 18 \\
28 & 24 \\
\hline
\end{array}
\]
Thus, the final answers are:
\[
\boxed{(x = 0, y = 0), (x = 7, y = 6), (x = 14, y = 12), (x = 21, y = 18), (x = 28, y = 24)}
\]