# Thread: Vector Equation of a Plane

1. ## Vector Equation of a Plane

Find a vector perpendicular to both i+2j-k and 3i-j+k. Hence find the Cartesian equation of the plane parallel to both i+2j-k and 3i-j+k which passes through the point (2,0,-3).

I managed to solve the first one but not the parallel part.

Explanation with the aid of diagram is much appreciated. Thanks in advance

2. ## Re: Vector Equation of a Plane

Originally Posted by Jin0730
Find a vector perpendicular to both i+2j-k and 3i-j+k. Hence find the Cartesian equation of the plane parallel to both i+2j-k and 3i-j+k which passes through the point (2,0,-3).

I managed to solve the first one but not the parallel part.

Explanation with the aid of diagram is much appreciated. Thanks in advance
If $u~\&~v$ are non-parallel vectors and $P: (a,b,c)$ then $(u\times v)\cdot=0$ is a plane which contains $P$ and is parallel to $u~\&~v$.

3. ## Re: Vector Equation of a Plane

Different way of saying the same thing: if <A, B, C> is a vector perpendicular to both vectors u and v, then $A(x- x_0)+ B(y- y_0)+ C(z- z_0)= 0$ is a plane parallel to both u and v and passing through $(x_0, y_0, z_0)$.