Originally Posted by

**Blizzardy** Hi guys, I am new to this forum, hope I posted this thread in the correct place...:)

Anyway,I got a question on vectors which I need help in:

The vector **q** is inclined at angles 135, 60 and \alpha where \alpha is an obtuse angle, to the x-,y- and z-axes respectively. The line L passes through the point A(2,-2,3) and is parallel to **q**. The plane 'pie' passes through B(5,-3,2) and contains the y-axis.

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(ii) Find the cartesian EQN of plane 'pie'

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From what i understand from 'contains y-axis', I think it means the plane is parallel to y-axis and this would mean the direction vectors of x- and z-axes is 0 right? But what does it mean? I am bad with planes + axes... I think (ii) and (iv) are related thats why I can't do (iv) as well but I do know about length of projection.

Sorry if my post is messy. Thank you!