(2/3 , 4/6) (-1/3 , 5/6)
slope = rise / run
m = (y2 - y1) / (x2 - x1)
m = (5/6 - 4/6) / (-1/3 - 2/3)
m = (1/6) / (-1)
m = -1/6
point-slope form, pick a point, doesn't matter which one, pick (-1/3, 5/6)
y - y1 = m (x - x1)
y - 5/6 = (-1/6)(x - -1/3)
y - 5/6 = (-1/6)(x + 1/3)
y - 5/6 = (-1/6)x - 1/18
y = (-1/6)x - 1/18 + 5/6
y = (-1/6)x - 1/18 + 15/18
y = (-1/6)x + 14/18
y = (-1/6)x + 7/9