In an area of the Great Plains, records were kept on the relationship between the rainfall (in inches) and the yield of wheat (bushels per acre). Find the least-squares regression line for the given data. Round the least-squares regress line values to three decimal places. Rainfall, x 10.5 8.8 13.4 12.5 18.8 10.3 7.0 15.6 16.0 Yield, y 50.5 46.2 58.8 59.0 82.4 49.2 31.9 76.0 78.8 OA. y=4.267x-4.379 OB. y=4.267x+4.379 OC. y=-4.379x+4.267 OD. y=4.379x+4.267