1. 

   math_celebrity Administrator Staff Member

   9 is the sum of thrice x and y
   
   Thrice x means multiply x by 3:
   3x
   
   Sum of this and y:
   3x + y
   
   Now we set this expression equal to 9:
   3x + y = 9

    

   math_celebrity, Mar 20, 2020

   #1
   
   

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