Show that there is a linear relationship between \(Y\) and \(X\).
The graph of \(Y\) against \(X\) is shown in the diagram.
\includegraphics[max width=\textwidth, alt={}, center]{cf9337b9-b766-4ce5-967c-5d7522e2aa42-4_748_858_849_593}
Find the value of \(n\) and the value of \(a\).