please help with how to do longhand

Find the equation of the regression line for the given data. Then construct a scatter plot of the data and draw the regression line. (The pair of variables have a significant correlation.) Then use the regression equation to predict the value of y for each of the given x-values, if meaningful. The table below shows the heights (in feet) and the number of stories of six notable buildings in a city. Height, x 774 625 521 508 497 477 (a) x = 502 feet (b) x = 644 feet Stories, y 51 47 44 43 38 35 (C) x = 810 feet (d) x = 724 feet Find the regression equation. y= * + (Round the slope to three decimal places as needed. Round the y-intercept to two decimal places as needed.)