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subtitusikan pertama
5x - 2y = 1
5x -2(4 +2x) = 1
5x - 8 -4x = 1
x - 8 = 1
x = 1 + 8
x = 9
subtitusikan kedua
y = 4 - 2x
y = 4 -2(9)
y = 4 - 18
y = - 14