Question 951990
x, length
y, width
p, perimeter


Let p=286;
{{{x=47+y}}};



FORMULA:


{{{p=2x+2y}}}


System of Equations:
{{{system(p=2x+2y,x=y+47)}}}


Substitution may be simplest, and solve for y first, symbolically - no numeric substitutions until the end.  Using the formula solution for y, solve for x.