Question

Judy built a rectangle patio that is 9 meters wide and has a perimeter of 40 meters what is the length of Judy's patio.

Answer 1

p = w + w + l + l
40 = 9 + 9 + l + l
40 = 18 + 2l
22 = 2l
11 = l
the length is 11

Answer 2

L = 11 m

Explanation:

The perimeter is 40 m, which in turn equals 2L + 2W. With W = 9 m, we have:

40m = 2L + 2(9 m), or 40 m = 2L + 18 m, or 22 m = 2L. Then L = 11 m.