Which pair of vectors is orthogonal?

Two vectors are orthogonal when their dot product is 0. For choice C, (−2)(−6) + (3)(−4) = 12 − 12 = 0, so the vectors ⟨−2, 3⟩ and ⟨−6, −4⟩ are orthogonal. The other pairs have nonzero dot products.

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