Math Problem Statement

are the vectors <-1, 0>, <2, 3>, <4, -1> linearly independent?

Solution

To determine if the vectors v1=1,0\mathbf{v}_1 = \langle -1, 0 \rangle, v2=2,3\mathbf{v}_2 = \langle 2, 3 \rangle, and v3=4,1\mathbf{v}_3 = \langle 4, -1 \rangle are linearly independent, we need to check if the following equation has only the trivial solution (i.e., all coefficients c1,c2,c3c_1, c_2, c_3 are zero):

c1v1+c2v2+c3v3=0c_1 \mathbf{v}_1 + c_2 \mathbf{v}_2 + c_3 \mathbf{v}_3 = \mathbf{0}

This translates to the system of linear equations: c11,0+c22,3+c34,1=0,0c_1 \langle -1, 0 \rangle + c_2 \langle 2, 3 \rangle + c_3 \langle 4, -1 \rangle = \langle 0, 0 \rangle

Breaking this down into two equations (for each component): c1+2c2+4c3=0- c_1 + 2c_2 + 4c_3 = 0 0c1+3c2c3=00c_1 + 3c_2 - c_3 = 0

We now solve this system. Let's solve it step by step:

  1. From the second equation: 3c2c3=0c3=3c23c_2 - c_3 = 0 \quad \Rightarrow \quad c_3 = 3c_2

  2. Substitute c3=3c2c_3 = 3c_2 into the first equation: c1+2c2+4(3c2)=0-c_1 + 2c_2 + 4(3c_2) = 0 c1+2c2+12c2=0-c_1 + 2c_2 + 12c_2 = 0 c1+14c2=0c1=14c2-c_1 + 14c_2 = 0 \quad \Rightarrow \quad c_1 = 14c_2

So, we have c1=14c2c_1 = 14c_2 and c3=3c2c_3 = 3c_2.

Since the only free variable is c2c_2, the solution is not the trivial solution unless c2=0c_2 = 0. If c2=0c_2 = 0, then c1=0c_1 = 0 and c3=0c_3 = 0 as well. However, if c20c_2 \neq 0, then the solution involves non-zero coefficients.

Thus, the vectors are linearly dependent, because there are non-trivial solutions to the system.


Do you have any questions or want further details?

Here are some related questions to expand on the topic:

  1. What does it mean for vectors to be linearly dependent or independent?
  2. Can vectors in a two-dimensional space ever be linearly independent if there are more than two vectors?
  3. How can we generalize the method for checking linear independence to vectors in higher dimensions?
  4. What is the geometric interpretation of linearly dependent vectors in 2D space?
  5. How does the concept of linear independence relate to matrix rank?

Tip: In 2D space, if you have more than two vectors, they will always be linearly dependent because the dimension of the space limits the number of independent directions.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Linear Algebra
Vector Spaces
Linear Independence
System of Linear Equations

Formulas

c1 * v1 + c2 * v2 + c3 * v3 = 0
-c1 + 2c2 + 4c3 = 0
3c2 - c3 = 0

Theorems

Linear Independence Criterion
Rank Theorem

Suitable Grade Level

Grades 11-12, College level