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g: y-y1=m(x-x1)
y-1=-1/2(x-2)
y-1=-1/2x+1
y = -1/2x +2
y - y1 = m (x - x1)
y - 1 = -1 (x - (-2))
y - 1 = -1x + 2
y = -1x + 2 +1
y = -1x +3
atau y + 1x - 3 = 0
maaf kalau salah jawabannya dan terima kasih