# Thread: Dimension of and Basis for Solution Set of Homogeneous System

1. ## Dimension of and Basis for Solution Set of Homogeneous System

This is probably pretty simple I just want to make sure I'm doing it right:

Find the dimension of and a basis for the solution set of the following homogeneous systems of equations:

1. x1+2x2-3x3+x4=0

2.x1+2x2=0
x1-x2=0

Any help would be appreciated! Thanks!

2. ## Re: Dimension of and Basis for Solution Set of Homogeneous System

Originally Posted by divinelogos
Find the dimension of and a basis for the solution set of the following homogeneous systems of equations: 1. x1+2x2-3x3+x4=0
Solving the system:

$\displaystyle \begin{bmatrix}{x_1}\\{x_2}\\{x_3}\\{x_4} \end{bmatrix}=\begin{bmatrix}{-2\lambda+2\mu-\gamma}\\{\lambda}\\{\mu}\\{\gamma}\end{bmatrix}= \lambda \begin{bmatrix}{-2}\\{1}\\{0}\\{0}\end{bmatrix}+\mu \begin{bmatrix}{2}\\{0}\\{1}\\{0}\end{bmatrix}+ \gamma \begin{bmatrix}{-1}\\{0}\\{0}\\{1}\end{bmatrix}$

Those three vectors span the subspace and are linearly independent. Try 2.

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### basis and dimension of homogenous sytem

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