Question 1186426
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Regarding such problems,  writing system of equations   TRADITIONALLY  is considered 


as trivial step and/or  SELF-EVIDENT  action.



The best applicable and accompanying &nbsp;<U>mathematical &nbsp;mantra</U> &nbsp;is to repeat these words every time


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;" write equations as you read the problem ".



<pre>
     x +  y =  525,

    8x + 6y = 3580.
</pre>