Question 806736
Use the idea that if |x| = k, then x = k or x = -k where k is some positive number.



So use that idea above to get....


|-3r|=9 


-3r = 9  or  -3r = -9 


r = 9/(-3)  or  r = -9/(-3)


r = -3 or  r = 3



Answers: r = -3 or  r = 3