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