A local school board proposed that the annual budget include the installation of air conditioning in the culinary arts wing of their high school. To support their proposal, they collected data and determined the following regression line for the given data, y = 0.449x - 30.27. Determine the residual of a data point for which x = 75 and y = 4.
Temperature, x 72 85 91 90 88 98 75 100 80
Number of absences, y 3 7 10 10 8 15 4 15 5