Algebra 1
posted by Elizabeth .
A rectangular piece of art is 4 meters wide and 6 meters long. It is surrounded by a uniform sidewalk. If the area of the uniform sidewalk is 39 square meters, how wide is the sidewalk

x + 6 = length of sidewalk
x + 4 = width of sidewalk
A = Lw
A = (x + 6)(x + 4)
(x + 6)(x + 4) = 39
Expand and solve for x