Examine the following table of points, which are all on a certain line. x y−2 40 21 13 −1what is the slope of this line? enter your answer as a number, like this: 42, or, if the slope is undefined, enter the lowercase letter "u".

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.