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Determine whether two vectors are orthogonal from their components Algebra II

Are \overrightarrow{u}=\dbinom{2}{3} and \overrightarrow{v}=\binom{-6}{4} orthogonal ?

Are \overrightarrow{u}=\dbinom{3}{5} and \overrightarrow{v}=\binom{-2}{4} orthogonal ?

Are \overrightarrow{u}=\dbinom{-1}{4} and \overrightarrow{v}=\binom{4}{1} orthogonal ?

Are \overrightarrow{u}=\dbinom{-1}{3} and \overrightarrow{v}=\binom{3}{7} orthogonal ?

Are \overrightarrow{u}=\dbinom{3}{-1} and \overrightarrow{v}=\binom{5}{15} orthogonal ?

Are \overrightarrow{u}=\dbinom{2}{4} and \overrightarrow{v}=\binom{3}{-2} orthogonal ?

Are \overrightarrow{u}=\dbinom{2}{0} and \overrightarrow{v}=\binom{-5}{4} orthogonal ?