The equation for the line of best fit for a data set is y = 2x + 1.5. If the point (1, 4) is in the data set, what is the residual of 1?

For x = 1, the line predicts y = 2(1) + 1.5 = 3.5. The residual is the observed value minus the predicted value: 4 − 3.5 = 0.5. So the residual is 0.5, choice A.

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