Question #272348

Are the following vectors linearly independent?

  1. (1, 2), (-2, 4)
  2. (0, 0, 1), (0, 1, 1), (1, 1, 1)
  3. (1, 2), (1, 3), (1, 1)
  4. (1, 2, 3), (2, 3, 4)
  5. (0, 1, 2), (2, 0, 1), (0, 0, 1), (3, 2, 1)
1
Expert's answer
2021-11-30T11:23:54-0500


1. Since 1224,\frac{1}{2}\ne\frac{-2}{4}, the vectors (1,2),(2,4)(1, 2), (-2, 4) are not collinear, and thus they are linearly independent.


2. Consider the linear combination a(0,0,1)+b(0,1,1)+c(1,1,1)=(0,0,0),a(0, 0, 1)+b (0, 1, 1)+c (1, 1, 1)=(0,0,0), which is equivalent to (c,b+c,a+b+c)=(0,0,0),(c,b+c,a+b+c)=(0,0,0), and hence a=b=c=0.a=b=c=0. We conclude that the vectors (0,0,1),(0,1,1),(1,1,1)(0, 0, 1), (0, 1, 1), (1, 1, 1) are linear independent.


3. Since in 2-dimentinal space any three vectors are linearly dependent, we conclude that the vectors (1,2),(1,3),(1,1)(1, 2), (1, 3), (1, 1) are linearly dependent.


4. Since 122334,\frac{1}{2}\ne\frac{2}{3}\ne\frac{3}4, we conclude that the vectors(1,2,3),(2,3,4)(1, 2, 3), (2, 3, 4) are not collinear, and hence they are linearly independent.


5. Since in 3-dimentinal space any four vectors are linearly dependent, we conclude that the vectors (0,1,2),(2,0,1),(0,0,1),(3,2,1)(0, 1, 2), (2, 0, 1), (0, 0, 1), (3, 2, 1) are linearly dependent.


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