As GeoGebra allows us to calculate with vectors, this is an easy task. Type the following lines into the input field and press the Enter key after each line.
A = (-2, 1)
B = (3, 3)
s = Segment[A, B]
T = A + 7/10 (B - A)
Another way of doing this could be
A = (-2, 1)
B = (3, 3)
s = Segment[A, B]
v = Vector[A, B]
T = A + 7/10 v
In a next step we could introduce a number t,
e.g. by using a Slider and redefine point T as T = A + t v (see
Redefine). By changing t you can see point T
moving along a straight line which could now be entered in parametric form (see
Line): g: X =
T + s v
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