Question 919951
Dimensions w and L.
L=w+7 and wL=18.


The system representing this:
{{{system(L=w+7,wL=18)}}}


SOLVE
{{{w(w+7)=18}}}
{{{w^2+7w-18=0}}}
{{{(w-2)(w+9)=0}}}


The meaningful solution of w is {{{highlight(w=2)}}};
{{{highlight(L=9)}}}.