Explanation:
rectangular patio.
one length is the side of the house (and no string of lights).
so, we know then
length + 2×width = 50 ft
and we know
length = 2×width + 6
me we can use that identity in the first equation and get
(2×width + 6) + 2×width = 50 ft
4×width + 6 = 50 ft
4×width = 44 ft
width = 11 ft
therefore,
length = 2×width + 6 = 2×11 + 6 = 22 + 6 = 28 ft