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(y+1)/ -3 = (x-3) /-15
-15y -15 = -3x + 9
3x - 15y -24 = 0 (A)
2. y = -3x + 12
gradiennya = -3
gradien tegak lurusnya = 1/3
y - (-6) = 1/3 (x - 4)
y + 6 = 1/3 x - 4/3
y = 1/3 x - 22/3
3y = x - 22
3y - x + 22 = 0 (tidak ada pilihan)