Linear Relationships and slope help pls ?

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet

Could someone me with this question i’ve been stuck on it for 20 minutes

Hundred and tens tables to make 430 in five different ways