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Math·Algebra·Linear equations in two variables

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Line $k$ is defined by $9x+2y-54=0$. Line $m$ is perpendicular to line $k$ in the xy-plane. What is the slope of line $m$?

A

$-\frac{9}{2}$

B

$-\frac{2}{9}$

C

$\frac{9}{2}$

D

$\frac{2}{9}$