Can you not solve it in excel please ? :)

ITown is a large computer discount store that sells computers and ancillary equipment and software in the town where State University is located. It has collected historical data on computer sales and printer sales for the past 4 years as follows: Year Personal Computer Sales (in hundreds) 10 Printers Sold (in hundreds) 5 4 1 9 WN 12 wo 4 8 a. Develop a linear trend line to forecast to the printer demand in year 5. b. Develop a linear regression model relating printer sales to computer sales to forecast printer demand in year 5 if 1500 computers are sold