Planes. Find the equations of the planes in both cartesian and (vector) form.

In summary: The plane that passes through the point (1, 6, 4) and contains the linex = 1 + 2t; y = 2 - 3t; z = 3 - t where t is an element of RThe plane that passes through the point (1, 6, 4) and contains the linex = 1 + 2t; y = 2 - 3t; z = 3 - t where t is an element of RLet L be the solution.L = (1,6,4) - ?
  • #1
dodgedanpei
2
0

Homework Statement



The plane that passes through the point (1, 6, 4) and contains the line
x = 1 + 2t; y = 2 - 3t; z = 3 - t where t is an element of R

Homework Equations



x = 1 + 2t; y = 2 - 3t; z = 3 - t

The Attempt at a Solution


Let L be the solution.
L = (1,6,4) - ?

t = (x -1)/ 2 = (2-y)/3 = 3-z
 
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  • #2
dodgedanpei said:

Homework Statement



The plane that passes through the point (1, 6, 4) and contains the line
x = 1 + 2t; y = 2 - 3t; z = 3 - t where t is an element of R

Homework Equations



x = 1 + 2t; y = 2 - 3t; z = 3 - t

The Attempt at a Solution


Let L be the solution.
L = (1,6,4) - ?

t = (x -1)/ 2 = (2-y)/3 = 3-z

These equations just represent the line that you are given. Instead of just throwing up a bunch of equations, say something about your thought process in finding the equation of the plane.
 
  • #3
Well I tried making 2 vectors by using the 3 equations.
I got
vector x = t(2,-3,-1) = (1,2,3)

But the two vectors are meant to be s(0,-4,7) + t(-8,0,25) , where s and t are real numbers.
 
  • #4
dodgedanpei said:
Well I tried making 2 vectors by using the 3 equations.
I got
vector x = t(2,-3,-1) = (1,2,3)
This doesn't make any sense at all. First off, <1, 2, 3> is a vector from the origin to the point (1, 2, 3) on the line. Second, the vector t<2, -3, -1> = <2t, -3t, -t> is a vector that has the same direction as the line.

There is no value of t for which t<2, -3, -1> = <1, 2, 3>. For every value of t, these vectors point in different directions.
dodgedanpei said:
But the two vectors are meant to be s(0,-4,7) + t(-8,0,25) , where s and t are real numbers.

Based on what you're showing is the answer, I don't believe that you have provided all of the information for this problem. If you know a point on a plane, and a line that goes through it, that is not enough information to determine the equation of a unique plane.

What is the complete statement of the problem?
 

1. What is a plane in mathematics?

A plane in mathematics is a two-dimensional flat surface that extends infinitely in all directions. It is defined by three non-collinear points or by a point and two non-parallel vectors.

2. How can you find the equation of a plane using three points?

To find the equation of a plane using three points, you can use the formula ax + by + cz + d = 0, where a, b, and c are the coefficients of the variables x, y, and z, and d is a constant. Substitute the coordinates of the three points into this formula and solve for a, b, c, and d.

3. Can you find the equation of a plane with only one point and a normal vector?

Yes, you can find the equation of a plane with only one point and a normal vector. The equation is given by (x-x0, y-y0, z-z0) · n = 0, where (x0, y0, z0) is the given point and n is the normal vector.

4. What is the difference between cartesian and vector form of a plane's equation?

The cartesian form of a plane's equation is ax + by + cz + d = 0, where a, b, and c are the coefficients of the variables x, y, and z, and d is a constant. This form is useful for finding the distance between a point and the plane. The vector form of a plane's equation is (x,y,z) = (x0, y0, z0) + s(a,b,c) + t(d,e,f), where (x0, y0, z0) is a point on the plane, (a,b,c) and (d,e,f) are two non-parallel vectors on the plane, and s and t are constants. This form is useful for finding points on the plane or for determining if a given vector is parallel to the plane.

5. How many equations are needed to represent a plane in three-dimensional space?

Two equations are needed to represent a plane in three-dimensional space. One equation can be used to determine the location of the plane in one direction, and the other equation can determine the location of the plane in another direction. These two equations can be in either cartesian or vector form.

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