# Thread: finding a direction vector , perpendicular to two lines

1. ## finding a direction vector , perpendicular to two lines

Find a direction vector of the line that is perpendicular to both:

$\displaystyle (x+1)/3=(y+1)/8=(z+1)/12$ and $\displaystyle (1-2x)/-4=(3y+1)/9=z/6$ .

2. Find a direction vector for each line and then take the cross-product of them both.