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y=-3x-12
y-y1=m(x-x1)
y-(-1)=-3(x-4)
y+1=-3x+12
y=-3x+12-1
y=-3x+11
2. maaf jawaban nomor dua sangat panjang
m1 = m2
m2 = -a/b = -3/1 = -3
y - y1 = m(x-x1)
y + 1 = -3(x - 4)
y + 1 = -3x + 12
y = -3x + 12 - 1
y = -3x + 11