# Math Help - Vector Question Help!!

1. ## Vector Question Help!!

The line L has a vector equation of r=2i-j+4k + s(i+j-k)

the point P lies on line L and the point Q has position vector of 2i-k

Q: Given that line PQ is perpendicular to L find the position vector of P?

2. So L passes through $(2, -1, 4), and\ (1+2, 1-1, -1+4) = (3, 0, 3)$