Question 852411
w width, y length

As started:  {{{2w+2y=74}}}

As changed:  width is 2w, and length is y+10; so perimeter is {{{2(2w)+2(y+10)=126}}}


Simplifying the two equations, cutting through the steps, the system is:
-------------------
w+y=37
-
2w+y=53
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Elimination Method:
{{{(2w+y)-(w+y)=53-37}}}
{{{highlight(w=16)}}}, .... {{{highlight(y=21)}}}.