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x + 2y = 11
2x - y = 2

eliminasi x:
2x + 4y = 22
2x - y = 2
---------------- -
      5y = 20
        y = 4

x + 2y = 11
x + 2(4) = 11
x + 8 = 11
        x = 3

Semoga membantu kaka.