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Math·Algebra·Linear equations in two variables

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Line $p$ is defined by $2y=8x-11$. Line $r$ is perpendicular to line $p$ in the $xy$-plane. What is the slope of line $r$?

A

$-\frac{1}{4}$

B

$\frac{1}{4}$

C

$-4$

D

$4$