Question 549836
let's let L be length and W be width.  
From the question we know that 
{{{L=8+W}}}

We also know that the perimeter of a rectangle can be calculated using the formula 
{{{P=2L+2W}}}

Now substituting the 8+W for L and the given perimeter we get:
{{{24=2(8+W)+2W}}}
{{{24=16+2W+2W}}}
{{{24-16=4W}}}
{{{8=4W}}}
{{{8/4=W}}}
{{{W=2}}}

Well if W=2, we can find the length using the first formula we can up with 
{{{L=8+W}}}
{{{L=8+2}}}
{{{L=10}}}