Finding Points Parallel to a Plane

In summary, a vector is parallel to a plane when it either lies entirely within the plane or is perpendicular to the plane's normal vector. This can be determined by using the dot product between the vector and the plane's normal vector. A vector can be parallel to multiple planes if it is perpendicular to the normal vectors of each plane. To find the equation of a plane parallel to a given vector, the point-normal form of a plane can be used. It is also possible for a vector to be parallel to a plane but not lie in the same plane if it is perpendicular to the plane's normal vector but does not intersect the plane at any point.
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If the vector $P = (1,2,-1)$ is parallel to the plane $7x+2y+kz = 5$, then what's the value of $k$?
 
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  • #2
Do you know how to find the general formula for points parallel to a plane?
 
  • #3
Deveno said:
Do you know how to find the general formula for points parallel to a plane?

So we find another plane parallel to this in which the point $(1,2,-1)$ lies?

I think $\mathbf{n} \cdot (\mathbf{x-x_{0}}) = 0$ so

$<7,2,k><x-1,y-2,z+1> = 0 \\
\implies 7x+2y+kz+k = 11 \\

\therefore 11-k = 5 \\

\implies k = 6.$
 

FAQ: Finding Points Parallel to a Plane

What does it mean for a vector to be parallel to a plane?

A vector is considered parallel to a plane when it lies entirely within the plane or is perpendicular to the plane's normal vector.

How can you determine if a vector is parallel to a plane?

To determine if a vector is parallel to a plane, you can use the dot product. If the dot product between the vector and the plane's normal vector is equal to 0, then the vector is parallel to the plane.

Can a vector be parallel to multiple planes?

Yes, a vector can be parallel to multiple planes. This occurs when the vector is perpendicular to the normal vectors of each plane.

How can you find the equation of a plane that is parallel to a given vector?

To find the equation of a plane that is parallel to a given vector, you can use the point-normal form of a plane. This involves selecting a point on the plane and using the vector as the normal vector in the equation.

Is it possible for a vector to be parallel to a plane but not lie in the same plane?

Yes, it is possible for a vector to be parallel to a plane but not lie in the same plane. This can occur when the vector is perpendicular to the plane's normal vector but does not intersect the plane at any point.

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