Question 380953
 The sum of two numbers is 89. Their difference is 13. What are the two numbers?
 Sol'n:
  let x & y - the numbers
   x+y = 89 ---(1)
   x-y = 13 ----(2)
Add, the 2 equations
  2x = 102, divide by 2 on both side
   x = 51
 for y:
   y = 89-x
     = 89-51
   y = 38
thus:
  x = 51 & y = 38 ----answer

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