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y2-y1 = x2-x1
y- 2 = x-1
-3-2 -1-1
y- 2 = x-1
-5 -2
-2(y -2) = -5(x-1)
-2y + 4 = -5x + 5
-2y + 5x = 5 - 4
-2y + 5x = 1
= 5x - 2y - 1 = 0 (a)
kalau salah, saya akan coba koreksi