Respuesta :

Answer:

r=6

Step-by-step explanation:

[tex]m=\frac{y2-y1}{x2-x1}[/tex]

m= -3

(2,8) (r,-4)

[tex]-3=\frac{-4-8}{r-2}[/tex]

[tex]-3r+6=-12[/tex]

[tex]-3r=-18[/tex]

r= 6

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