Answer
$(-1,0)\cdot(0,1)=0$
Work Step by Step
If the vectors are perpendicular, their dot product must be zero.
Dot product$=(-1,0)\cdot(0,1)=-1(0)+0(1)=0+0=0$.
Therefore, $-\textbf {i}$ and $\textbf {j}$ are perpendicular.
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