The most appropriate answer to fill in the blank is:
A equation
A linear model is often expressed as an equation, typically in the form \(y = mx + b\), where \(m\) represents the slope (the constant rate of change), and \(b\) is the y-intercept.
While a graph (B) can represent a linear model visually, it is not a mathematical representation in the same way that an equation is. A table (C) can show values related to a linear model but doesn't define the model itself. An ordered pair (D) represents a specific point, not the overall model. A printout (E) and digitization (F) are not directly related to defining a linear model.
Therefore, the correct answer from your options would primarily be:
A equation