Question 978051
{{{system(L=2w+7,2w+2L=68)}}}, but you CAN start this completely in symbols if you want to, and sometimes doing that way is an excellent way.


{{{2w+2(2w+7)=68}}} using simple substitution;
Divide both sides by 2, just for convenience, since both members are products of 2;
{{{w+2w+7=34}}}
{{{3w+7=34}}}
{{{3w=34-7}}}
{{{3w=27}}}
{{{highlight(w=9)}}}--------Use this to evaluate L.


{{{L=2w+7}}}
{{{L=2*9+7}}}
{{{L=18+7}}}
{{{highlight(L=25)}}}