The kenght of a rectangular field is 8 metres less than twice is breath if the perimeter of the rectangular field is 56 metres find the breath
L + 8 = 2 b
2 L + 2 b = 56
----------------------- add
3 L + 8 + 2 b = 2 b + 56
3 L = 48
etc
2 L + 2 b = 56
----------------------- add
3 L + 8 + 2 b = 2 b + 56
3 L = 48
etc