Question 517076
The formula for perimeter is
{{{ P = 2W + 2L }}}
given:
{{{ W = L/2 + 4 }}}
{{{ P = 92 }}} m
By substitution:
{{{ P = 2*( L/2 + 4 ) + 2L }}}
{{{ 92 = 2*( L/2 + 4 ) + 2L }}}
{{{ 92 = L + 8 + 2L }}}
{{{ 3L = 92 - 8 }}}
{{{ 3L = 84 }}}
{{{ L = 28 }}} m
and, since
{{{ W = L/2 + 4 }}}
{{{ W = 14 + 4 }}}
{{{ W = 18 }}} m