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y2 - y1 x2 - x1
y - (-1) ⇒ x - 4
-3 - (-1) 0 - 4
y+1 ⇒ x - 4
-2 -4
perkalian silang
-4 (y+1) = -2 (x-4)
-4y+-4 = -2x+8
-4y + 2x - 12 = 0
sederhanakan (bagi 2 semua)
-2y + x - 6 = 0
D jawabannya masalh koefisien gak masalh yang penting komponen x dan y
-2y + x - 6 = 0 --> D. x - 2y = 5