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= -1/3
y - y1 = m ( x - x1)
y - 4 = -1/3 ( x - 2)
y - 4 = -1/3x + 2/3
y = -1/3x + 2/3 + 4 ------------> sederhanakan X 3
3y = - x + 2 + 12
3y = -x + 14