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Let a = 5i6k and b = 4i+2k . Represent the vector r = 5k as a linear combination of vectors a and b ,

Let a = 5i−6k and b = 4i+2k. Represent the vector r = 5k as a linear combination of vectors a and b, that is, find two scalars α and β such that r = αa + βb.

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