can somebody help me out with part d of this? IB exams tomorrow haha http://imageshack.us/photo/my-images/716/picture4ai.png/

Question

turingtest · Answer

for the first one you need a vector that is parallel to the line $L_1$
can you think of one?

tcp2315 · Answer

yeah the answer to a) is r= (8, 1, 0) + t(0,0,1) those should be vertical but i dont want to draw them

turingtest · Answer

ok, so you understand a)
?

tcp2315 · Answer

yeah, and b and c

 in fact...

tcp2315 · Answer

a) r = (8, 1, 0) + t (0, 0, 1) 

b) you dont need this for question D, but just setting the respective x, y, and z, coordinates lets s=2 which proves it.

c) i) showing it isnt useful for D
 ii) AB = (2, -1, 5)

turingtest · Answer

yeah D is a bit tougher... I'll have to think about that one.

tcp2315 · Answer

i have the answer if you want it, but i cant justify it and i got it from the answer key.

D= C+AB, or (4, -2, 9)