Example Problems
Examples
System of linear equations
A system of linear equations consists of multiple equations that are solved simultaneously. The easiest method to solve systems of linear equations is through Gaussian elimination.
Examples
Overview for the next topics:
Linear combinations
A linear combination of a set of terms is a sum of each term multiplied by a constant. Since a linear combination is basically a weighted sum of each term, the constant coefficients can be thought of as “weights.”
Examples
Span
Examples
Calculation
Example 1
We can just solve the augmented matrix:
Example 2
Let's row-reduce the matrix:
In other words, we could have row-reduced the following augmented matrix:
Linear independence
In other words, a set of vectors is linearly independent if and only if none of its elements is a linear combination of the other elements. Else, the set is considered linearly dependent.
Calculation
To determine whether a set of vectors is linearly independent, we find solutions to the equation
If we have pivots in every column, we know that the vectors are linearly independent.
Example 1
We first row-reduce the matrix:
We see that there is no pivot in the third column. Therefore, the given vectors are linearly dependent.
Example 2
Let's row-reduce the matrix:
We observe that there is a pivot in every column of the matrix. Therefore, the given vectors are linearly independent.
Extra Resources
Links to Guerrilla Section Problems and solutions
Guerilla section 1 Problems
Guerilla section 1 Solutions
Links to Exam Problems
https://tbp.berkeley.edu/courses/ee/16A/
https://hkn.eecs.berkeley.edu/exams/course/ee/16a
Vidoes elaborating guassian elimination
https://www.youtube.com/watch?v=2j5Ic2V7wq4 https://www.youtube.com/watch?v=xCIXkm3-ocQ https://www.youtube.com/watch?v=g0h_s1p0ax0
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