\blue E=\red F

P_1 = (0.84, 3.8)
P_2 = (4.68, 0.76)
P = (1.44, -1.84)
Q = (-2.12, -0.76)
v = Vector(P, P_2)
u = Vector(P, P_1)
w = Vector(Q, P)
b = Vector(Q, P_2)
a = Vector(Q, P_1)
f = Line(P_1, P_2)
k = 0.3333333333333333 (slider from 1 / 12 to 1, step 1 / 12)
text3 = SurdText(k)
l: 1 - k
text4 = SurdText(l)
E: Q + (k * b) + (l * a)
F: P + (k * v) + (l * u)
c = Vector(Q, E)
d = Vector(P, E)
text1: "F=P + " + (LaTeX[text3]) + "\overrightarrow{PP_1} + " + (LaTeX[text4]) + "\overrightarrow{PP_2}"
text2: "E=Q + " + (LaTeX[text3]) + "\overrightarrow{QP_1} + " + (LaTeX[text4]) + " \overrightarrow{QP_2} "