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Answers for “如果两个向量共线,它们的张成空间是什么?”

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A linear combination of two arbitrary non-collinear vectors v⃗\vec{v} and w⃗\vec{w} is formed by multiplying each vector by a scalar (aa and bb) and adding them together (av⃗+bw⃗a\vec{v} + b\vec{w}). If both scalars are allowed to vary continuously across all real numbers, the tips of these combined vectors sweep out every possible point on the 2D plane.

Conditions: The two vectors v⃗\vec{v} and w⃗\vec{w} are non-collinear (point in different directions and do not lie on the same line).; The scalars aa and bb vary continuously across all real numbers.

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The span of two arbitrary vectors v⃗\vec{v} and w⃗\vec{w} that do not lie on the same line is the entire 2D plane. This is achieved by taking all possible linear combinations av⃗+bw⃗a\vec{v} + b\vec{w} where scalars aa and bb vary continuously across all real numbers.

Conditions: Two vectors v⃗\vec{v} and w⃗\vec{w} are nonzero; Vectors v⃗\vec{v} and w⃗\vec{w} are non-collinear (point in different directions)