Question 1204238
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How nice it is to see that you have learned what I taught you once .
After all, I taught you that one of the possible systems is this pair 
of equations x = 4 and y = 2.


I remember very well how I explained it to you. . . although you do not refer to my teaching . . . 


Now, here is another system of linear equations with the solution (4,2), as you request it :


    x + y = 6,    (1)

    x - y = 2.    (2)
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