Maria gathered the data in the table. She finds the line of best fit to be y = 2.78x - 4.4.

What is the residual value when x = 4?

-6.72

-0.58

0.58

6.72

The correct answer would be C. 0.58

You plug 4 into the line of best fit and get 6.72. This is your predicted value, but the residual is the difference between the actual value and predicted. So you subtract: 7.3-6.72=0.58.

The data in the table is not shown here but here is the formula for the residual

residual = observed value - predicted value

To get the predicted value, you simply use the best fit equation:

y = 2.78x - 4.4

Substituting 4:

y = 2.78 (4) - 4.4

y = 6.72

This value is subtracted from the observed value to get the residual.