Question 895123
w and L.
{{{L=2w}}}
{{{A=wL}}}
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Changes to w and L.
L-10 for length
w+8 for width
{{{A+100=(w+8)(L-10)}}}


Substitute for A.
{{{wL+100=(w+8)(L-10)}}}
Begin simplifying.
{{{wL+100=wL+8L-10w-80}}}
{{{100=8L-10w-80}}}
{{{180=8L-10w}}}
{{{50=4L-5w}}}


We were given a description for how L and w are related; so substitute for L.
{{{4L-5w=50}}}
{{{4*2w-5w=50}}}
{{{3w=50}}}
{{{w=50/3}}}
{{{highlight(w=16&2/3)}}}
{{{L=2(16&2/3)}}}
{{{L=32+4/3}}}
{{{highlight(L=33&1/3)}}}