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x2 = -4 y2=1
Pertama cari persamaan garisnya dulu:
-6( y+2) = 3(x-2)
-6y -12 = 3x -6
-6y = 3x-6+12
-6y = 3x + 6
y = x -1
Jadi ketemu gradiennya =
Nah kalau tegak lurus berarti gradiennya dibalik dan berubah tanda, menjadi 2.