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May 25th, 2009, 10:05 AM   #1
Joined: May 2009

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Vector question. What am I doing wrong?

Here I have a supposedly simple vector question but my answers contradict themselves. What am I doing wrong?

A(1,3,2) u= i + 3j +k v= 3j-k

a) If vector AB = u - v what are coordinates of B

AB = OB - OA

OB = (u -v) + OA

OB = (2,3,4)

b)i) Write down the parametric equation of the line L, passing thorugh the point A in the direction of AB.

L = OA + m(AB)

L = (1,3,2) m(1,0,2)

ii) What is the value of m at which L cross the YZ plane.

L crosses the YZ plane when x= 0

(0,y,z) = (1,3,2) + m(1,0,2)

0 = 1 + m
y = 3
z= 2 + 2m

My problem here is that the z turns out to be zero. This is not possible since it says it crosses the YZ plane.
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