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jadi gradien garisnya = -3/-2
kalo gak salah sih gitu :D
> -2y = -3x + 4
> y = 3/2 x -2
m1 = 3/2
m2+m1 = -1
>m2 + 3/2 = -1
>m2 = -3/2 - 1
>m2 = -5/2
kalau gak salah sih,,, coba dikoreksi lagi