Which of the following are linear combinations of ๐ขย =ย 0,-2,ย 2 and๐ฃย =ย 1,ย 3,ย -1?
Question
Which of the following are linear combinations of ๐ขย =ย 0,-2,ย 2 and๐ฃย =ย 1,ย 3,ย -1?
Solution
A linear combination of vectors ๐ข and ๐ฃ is any vector that can be obtained by multiplying each vector by a scalar and then adding (or subtracting) the results. In mathematical terms, any vector ๐ค that can be written as ๐๐ข + ๐๐ฃ, where ๐ and ๐ are scalars, is a linear combination of ๐ข and ๐ฃ.
Given ๐ข = 0,-2,2 and ๐ฃ = 1,3,-1, let's consider a general vector ๐๐ข + ๐๐ฃ = (๐0 + ๐1, ๐*(-2) + ๐3, ๐2 + ๐*(-1)) = (๐, -2๐ + 3๐, 2๐ - ๐).
So, any vector (๐ฅ, ๐ฆ, ๐ง) that can satisfy this equation for some values of ๐ and ๐ is a linear combination of ๐ข and ๐ฃ.
For example, if we take ๐ = 1 and ๐ = 2, we get the vector (2, -2 + 6, 2 - 2) = (2, 4, 0), which is a linear combination of ๐ข and ๐ฃ.
On the other hand, a vector like (1, 1, 1) is not a linear combination of ๐ข and ๐ฃ, because there are no values of ๐ and ๐ that can satisfy the equation (1, 1, 1) = (๐, -2๐ + 3๐, 2๐ - ๐).
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