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Math·Algebra·Linear functions

hard

Line $h$ is defined by $\frac{1}{2}x+\frac{1}{5}y-40=0$. Line $j$ is perpendicular to line $h$ in the xy-plane. What is the slope of line $j$?

A

$-\frac{5}{2}$

B

$-\frac{2}{5}$

C

$\frac{5}{2}$

D

$\frac{2}{5}$