\overrightarrow{u}

A = Point(xAxis)
t = 0.15 (slider from -4 to 2, step 0.05)
C = Point(zAxis)
u = Vector(A, C)
M: A + (t * u)
i = Segment(A, M)
A1: (-8, -6, 2)
A2: (-8, -2, 2)
A2' = Translate(A2, u)
c = Vector(A2, A2')
E = Midpoint(A2, A2')
texte1: "\overrightarrow{AM}=t\overrightarrow{u}=" + (LaTeX[t]) + "\overrightarrow{u}"