The length of a rectangle is 4yd longer than its width. If the perimeter of the rectangle is 28yd , find its area

l=w+4
P=2(l+w)=28 
or l+w=14 and so l=14-w 
which leads us to 
w+4=14-w 
w+w+4-4=14-4-w+w 
2w=10 
and w=5 
therefore l=5+4=9 
and that means A=lw=(9)(5)=45 square yards 



:)