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x - 2y = 8 (dikali 3)
lalu kurangkan pers. tersebut & dapat y = -24/5 = -4,8
Subtitusikan y = -4,8 ke 3x - y = 0
3x - y = 0
3x -(-4,8) = 0
3x + 4,8 = 0
3x = - 4,8
x = -1,6
Jadi x + y = -1,6 + (-4,8) = -6,4