Which pair of vectors is orthogonal?

Two vectors are orthogonal when their dot product is zero. For choice C, ⟨−2, 3⟩ · ⟨−6, −4⟩ = (−2)(−6) + 3(−4) = 12 − 12 = 0. Therefore, the pair ⟨−2, 3⟩ and ⟨−6, −4⟩ is orthogonal.

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