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Math·Algebra·Linear equations in two variables

easy

Line $k$ is defined by $y=7x+\frac{1}{4}$. Line $j$ is perpendicular to line $k$ in the xy-plane. What is the slope of line $j$?

A

$-4$

B

$-\frac{1}{7}$

C

$\frac{1}{4}$

D

$7$