Respuesta :

dohertysa8

Answer:

r=-11

Step-by-step explanation:

substitute -11 and -9 for r.

-3=3(r+10)

-3=3(-11 +10)

-3=-33+30

-3=-3

-3=3(r+10)

-3=3(-9+10)

-3=-27+30

-3=3

(that does not make sense, -3=3, so r would be -11.)