Let W be the union of the first and third quadrants in the xy - plane. That

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Let W be the union of the first and third quadrants in the xy - plane. That is, let
Let W be the union of the first and third

a. If u is an W and c is any scalar, is cu in W? Why?
b. Find specific vectors u and v in W such that u + v is not in W. This is enough to show that W is not a vector space?

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