$點斜式y - y(P) = b / a (x - x(P))⇔y-y_0=m(x-x_0)$
$參數式Curve[x(P) + a t, y(P) + b t, t, x(Corner[1]), x(Corner[2])]⇔\left\lbrace \begin{array}{jj} x=x_0+at \ y=y_0+bt  \end{array}  \right.\ t∈ℜ $
$Curve[x(P + a t), y(P + b t), t, x(Corner[1]), x(Corner[3])]$
$向量式Curve[x((x(P) + a t) u + (y(P) + b t) v), y((x(P) + a t) u + (y(P) + b t) v), t, x(Corner[1]), x(Corner[2])]$
$Curve[x(P + a t u + b t v), y(P + a t u + b t v), t, x(Corner[1]), x(Corner[2])]$
$\fgcolor{red}{Curve[x(P + a t u + b t v + c t w), y(P + a t u + b t v + c t w), t, x(Corner[1]), x(Corner[2])]} $
$⇔\left\lbrace \begin{array}{jj} x=x_0+at \ y=y_0+bt\z=z_0+c t  \end{array}  \right.\ t∈ℜ$

A = (-7, 0)
B = (-6, 0)
C = (-7, 1)
u = Vector(A, B)
v = Vector(A, C)
P = (-9.26, 0.74)
a = 2 (slider from -5 to 5, step 0.1)
b = 3 (slider from -5 to 5, step 1)
text1: "L過P" + (LaTeX[P]) + "且方向向量為(" + (LaTeX[a]) + "," + (LaTeX[b]) + ")"
c_1 = CurveCartesian(x(P) + a * t, y(P) + b * t, t, x(Corner[1]), x(Corner[2]))
c_3 = CurveCartesian(x((x(P) + a * t) * u + (y(P) + b * t) * v), y((x(P) + a * t) * u + (y(P) + b * t) * v), t, x(Corner[1]), x(Corner[2]))
L: y - y(P) = b / a * (x - x(P))
c_4 = CurveCartesian(x(P + a * t * u + b * t * v), y(P + a * t * u + b * t * v), t, x(Corner[1]), x(Corner[2]))
c_2 = CurveCartesian(x(P + a * t), y(P + b * t), t, x(Corner[1]), x(Corner[3]))
c = 1 (slider from -5 to 5, step 0.1)
D = (-7.54, -0.46)
w = Vector(A, D)