Answers

1. Answer:

   {(5, 3)}

   Step-by-step explanation:

   Consider the system :

   x + 2y = 11

   x – 2y = -1

   We notice that :

   5 + 2×3 = 11

   5 – 2×3 = -1

   We conclude that :

   (5, 3) is the solution to the system.

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