Question 464455
{{{L=W+4.5}}}
{{{A=LW}}}
{{{A=(W+4.5)(W)}}}
{{{A=(W^2+4.5W)}}}
{{{243=W^2+4.5W}}}
{{{W^2+4.5W-243=0}}}
Using the quadratic formula, you can solve for W, and then substitute this into the first equation to solve for L.