Long description: zfig2

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• The image displays a two-dimensional Cartesian coordinate system with the horizontal axis labeled \(n\) and the vertical axis labeled \(y_n\).
• A dashed line, which represents the function \(y(n) = 2n + 7\), is drawn across the plot.
• Several discrete points are plotted on the graph, corresponding to integer values of \(n\).
• The first visible point is plotted at \(n=1\), where the corresponding \(y\)-value is \(9\).
• A second point is plotted at \(n=2\), where the corresponding \(y\)-value is \(11\).
• A third point is plotted at \(n=3\), where the corresponding \(y\)-value is \(13\).
• Dashed vertical lines are drawn from each plotted point down to the horizontal axis, emphasizing the discrete nature of the sampled points.