Solving Linear Equation Systems: Intersection & Geometric Interpretation

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SUMMARY

The discussion focuses on determining the intersection of two planes represented by the equations 4x - 3y - z - 1 = 0 and 2x + 4y + z - 5 = 0. It is established that these planes intersect along a line rather than at a single point. The solution involves rewriting the equations in terms of z, leading to the parametric equations for the line of intersection. The key takeaway is that two planes cannot intersect at a single point, and the intersection can be expressed parametrically.

PREREQUISITES
  • Understanding of linear equations and their geometric interpretations
  • Familiarity with parametric equations
  • Knowledge of vector operations, specifically direction and normal vectors
  • Ability to manipulate algebraic equations to find intersections
NEXT STEPS
  • Study the geometric interpretation of linear equations in three-dimensional space
  • Learn how to derive parametric equations from linear equations
  • Explore vector algebra, focusing on direction and normal vectors
  • Investigate systems of linear equations and their solutions in higher dimensions
USEFUL FOR

Students studying linear algebra, mathematicians interested in geometric interpretations, and educators teaching systems of equations in three-dimensional space.

kaybaby
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Homework Statement


Determine whether the following planes are parallel or intersect. If they intersect, find the equation of the line of intersection. Interpret this system of two linear equations geometrically.

4x - 3y - z - 1 = 0 and 2x + 4y + z - 5 = 0


Homework Equations





The Attempt at a Solution


I've shown that the plane intersect at one point, and calculated the direction vector, as well as the the two normal vectors. how am i supposed to find the equation of the line of intersection if i do not get a point?
 
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have a think geometrically - how can 2 planes intersect in a single point?
 
kaybaby said:

Homework Statement


Determine whether the following planes are parallel or intersect. If they intersect, find the equation of the line of intersection. Interpret this system of two linear equations geometrically.

4x - 3y - z - 1 = 0 and 2x + 4y + z - 5 = 0
These are the same as z= 4x- 3y- 1 and z= -2x- 4y+ 5. On their line of intersection (as lanedance implies, two planes cannot intersect at a single point), z= 4x- 3y- 1= 2x- 4y+ 5. You can solve that for y as a linear function of x, then put that back into either equation to get z as a linear function of x. Set x= t and you have parametric equations for the line of intersection.


Homework Equations





The Attempt at a Solution


I've shown that the plane intersect at one point, and calculated the direction vector, as well as the the two normal vectors. how am i supposed to find the equation of the line of intersection if i do not get a point?
 

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