tolong jawab dgn cara no13

(2 , 1) dan (3 , 6)
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 1) / (6 - 1) = (x - 2) / (3 - 2)
(y - 1) / 5 = (x - 2) / 1
y - 1 = 5x - 10
5x - 10 = y - 1
5x - y - 10 + 1 = 0
5x - y - 9 = 0
m = -a/b
m = -5 / -1 = 5
I. m = -(-5) / 1 = 5
II. m = -5 / 1 = -5
III. m = -(-1) / 5 = 1/5
IV. m = -1/5
yg sejajar = yg memiliki gradien yg sama
jawaban : A. I
semoga membantu