Help!! very easy math! please answer correctly. <3

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?