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Math·Algebra·Linear functions

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$x$	$y$
0	$r$
4	$r-24$
8	$r-48$

For a linear relationship between $x$ and $y$, the table gives three values of $x$ and their corresponding values of $y$ in terms of a constant $r$. What is the slope of the line in the xy-plane that represents this relationship?

A

$-24$

B

$-6$

C

$6$

D

$24$