i have 2 questions here which probably aren't as hard as i think but my teacher never taught me how to do it, so can anyone help?

1) determine if the vector [1,-1,5] is perpendicular to [x,y,z] = [3,-1,5] + t [2,-3,-1]

2) Determine if these two equations intersect

[x,y,z] = [4,-3,2] + t [1,8,-3]

[x,y,z] = [2,-19,8] + t [4,-5,-9]

...actually i got it.. i figured it out..thanks anyways