Question 6562
This is a question on translating english to algebrese. 

Let width = W, length = L. 

{{{system( W = L-10, W+L+W+L=100 ) }}}

that's a linear system:

{{{system( W-L=-10, 2W+2L=100 ) }}}

*[invoke linear "W", "L", 1, -1, -10, 2, 2, 100 ]