91+8=99 Hope I helped. :)
-9y + 8 = -91-9y = -91 -8-9y = -99y = -99-----9y = 11-99/-9 = 11 because -9X11 = -99
8 + 91 = 99
82
199 + 199 + 199 + 199 + 99 + 99 + 99 = 1192
few errors in your title: 2 plus 4 = 6 6 plus 9 = 15 10 plus 25 = 35 18 + 81 = 99
63 +99 ___ 162
equals 99
2 + 5 + 9 + 99 = 115
294
3097
104