The area of a rectangle is 56 square meters. Find the length and width of the rectangle if it's length is 2 meters greater than it's width.

2(l+w)=56

so our first equation is...
1) l+w=28

comparing length and width...
l=w+2

so our second equation is...
2) l-w=2

system:
1) l+w=28
2) l-w=2
adding equations leads to
2l=30
so
l=15
w=13