Question 131395
1) 
    let one number be x
    therefore other number is = x + 9  (since one number is 9 more than other number)

   sum of both number = 17
     
     x + x + 9 = 17
 
     2x + 9 = 17
     2x + 9 - 9 = 17 - 9
     2x = 8
     2x/2 = 8/2
       x = 4
      
  therefore 
    one number is x = x = 4
    other number = x + 9 = 4 + 9 = 13

2) 
    let one number be x
    therefore other number is = x + 12  (since one number is 12 more than other number)

   sum of both number = 26
     
     x + x + 12 = 26
 
     2x + 12 = 26
     2x + 12 - 12 = 26 - 12
     2x = 14
     2x/2 = 14/2
       x = 7
      
  therefore 
    one number is x = x = 7
    other number = x + 12 = 7 + 17 = 19
    

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