The rate of change of a linear function is represented by its slope. The slope can be calculated using the formula: slope = (change in y) / (change in x). By examining the graph, you can identify the slope of the given line. A steeper line indicates a larger rate of change. Therefore, to find a linear function with a larger rate of change, you would look for a line that is steeper than the one shown in the graph. This involves comparing the slopes of the lines visually or through calculation.