直线2x+3y-1=0 k = -2/3
k' = (-1) / k = 3/2
y = k'x + b
y = 3x/2 + b
0 = 3/2 * (-1) + b
b = 3/2
y = 3x/2 + 3/2
3x - 2y + 3 = 0