(3 points) Find the least-squares regression line y - bo + bit through the points (-1, 1), (1, 7), (4, 14), (7, 18), (9, 24), and then use it to find point estimates y corresponding to c - 5 and c = 7. For this problem and to give you practice for the test, use the shortcut method to find bo given that b, - 2.17647058823529. For T - 5, 3 - For t - 7. y =