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To determine the rate of change of the linear function, we can look at the difference in the y-values corresponding to the difference in the x-values.
From the table, we see that when x changes from 2.6 to 3.23, y changes from -6 to -5.
The difference in y-values is -5 - (-6) = 1.
The difference in x-values is 3.23 - 2.6 = 0.63.
Therefore, the rate of change of the linear function is 1 / 0.63 = 1.587.