Manipulate the Geogebra applet to help visualise the problem you are solving.[br][br]For this example you can use the sliders to edit the components of each point and vector.
What is the minimum amount of information needed to find the equation of a line in 3D?
Either: [br]- a point and a direction vector[br]- two points[br]- a point and a parallel line[br]- a point and any other information specifying a direction