An article presents a model for calculating bond-length distortion in vanadium-bearing tourmaline. To check the accuracy of the model, several calculated values (x) were compared with directly observed values (y). The results (read from a graph) are presented in the following table.

Observed Value	Calculated Value	Observed Value	Calculated Value
0.34	0.36	0.74	0.78
0.36	0.36	0.79	0.86
0.54	0.58	0.97	0.97
0.56	0.64	1.03	1.11
0.66	0.64	1.1	1.06
0.66	0.67	1.13	1.08
0.74	0.58	1.14	1.17

a. Compute the least-squares line y = 0 + 1 x.Round answers to four decimal places.

The least-squares line is y = ? + ?x.