Its late and my head is not on straight... Our question was find the distance of intersection of plane one and plane two from the origin. I found the line, but i dont know if the vector or scalar projection is the distance between that line and the origin.
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Scalar projection means it's just a number. A vector is composed of smaller elements with a direction. For a length you would typically start with a vector and then take it's length (sqrt(x^2 + y^2 + z^2)) to create a scalar number. In your case you need to find the vector between the origin and perpendicular to the line of intersection (i.e. the closest point on the line to the origin) and then calculate it's length in scalar format.