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X + y = 3. x - y = 7

What two numbers added together equals 3and then when it is subtracted equals 7
 
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1 Answer

    x + y = 3
+
    x - y = 7  

   2x = 10 ----> x = 5

  5 + y = 3 ----> y = - 2

5 + (- 2) = 3
 5 - (- 2) = 7