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y=(9 - 3x) / 7⇒ m1 = -3/7
syarat sejajar, m1=m2 ⇒ m2= -3/7
y - y1 = m (x- x1) ⇒ y - 1 = -3/7 (x - 6)
y - 1= -3/7 x +18/7
y = -3/7 x + 18/7 + 7/7
y = -3/7 x + 25/7
y = -1/7 (3x - 25)