Question 1024275
Rectangle A
{{{L and w}}}
{{{L=4w}}}
{{{2L+2w=perimA}}}


Rectangle B
{{{x and y}}}
{{{y=4x}}}
{{{2y+2x=perimB}}}


{{{system(L=3y,perimA-perimB=16)}}}


{{{system(L=3y,y=4x,2L+2w-(2y+2x)=16)}}}
This seems to not be enough.  Making the substitution for L and y, you would have one
equation but still two variables.