Answer :
-9 < 6 -v < 9 . . . . two inequalities
-15 < -v < 3 . . . . . subtract 6
-3 < v < 15 . . . . . . multiply by -1
-15 < -v < 3 . . . . . subtract 6
-3 < v < 15 . . . . . . multiply by -1
