Question

Determine the width of the garden. Nina must put 60 feet of fencing around her rectangular garden. The length of the garden is three feet longer than twice the width. What is the solution set for 2w + 2(2w + 3) = 60 given the replacement set {6, 7, 8, 9}?

Answer 1

Ok so you already have the formula so basically plug in the numbers (6,7,8,9) into the equation till you find the one that makes a true statement.
2*6+2(2*6+3)= 42
do the same for the rest and you will find that 9 is the width
2*9+2(2*9+3)=60