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m=2/3
y-y1 = m (x-x1)
y - (-3) = 2/3 (x - (-1)
y+3 = 2/3 (x + 1)
y + 3 = 2/3x + 2/3
y = 2/3x + 2/3 - 3
maaf jika belum memuaskan