The length of a rectangular floor is 2 feet more than its width. the area of the floor is 168 square feet. kim wants to use a rug in the middle of the room and leave a 2-foot border of the floor visible on all sides. what should the length (the longer side) of the rug be?

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)