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y - y1 = m ( x - x1)
y -(-8) = - 2/3 ( x - 3)
y + 8 = -2/3 x + 2/3(3)
y + 8 = - 2/3 x + 2
-------------------------- semua ruas kalikan dengan 3
3y + 24 = -2x + 6
3y + 2x = 6 - 24
3y + 2x = - 18