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Gradiennya adalah : m = - A / B
Pilihan A:
3x + 2y + 7 = 0
Gradien = - 3 / 2 (Salah)
Pilihan B:
3x - 2y - 10 = 0
Gradien = - 3/(-2) = 3/2 (Salah)
Pilihan C:
2x + 3y - 8 = 0
Gradien = - 2 / 3 (Salah)
Pilihan D:
2x - 3y + 9 = 0
Gradien = - 2/(-3) = 2/3 (Benar)