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x-2y = 4
(dieliminasi dgn tanda + agar 2y hilang dan bisa mencari nilai x)
4x+2y = 6
x-2y = 4
---------------- +
5x = 10
x = 2
di subtitusikan ke salah satu spl nya.
untuk mencari nilai y
x-2y = 4
2 - 2y = 4
-2y = 2
y = -1