November 2018 1 51 Report
Resuelve los sistemas con dos incógnitas:

1)
x + y = 2
2x - y = 1

2) 3x + 2y = 3
-x + y = -1

3)
2x + y = 3
-x + y = -3

4)
x - y = 5
2x + 2y = 2


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