KAO: Ch8 - Vector Equation of line vs Slope-Intercept Equation of line
Vector equation of a line vs. Slope-Intercept equation of a line.
Notice how the direction vector determines the slope (same numbers) and that the direction vector does not have to be on the line.
Notice how the position vector u is not required to be an axis intercept, it can point anywhere in 2D or 3D