My Math Forum Vector question. What am I doing wrong?

 May 25th, 2009, 10:05 AM #1 Newbie   Joined: May 2009 Posts: 1 Thanks: 0 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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### is AB=OB-OA wrong?

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