Jawabanmu

2014-02-10T05:36:22+07:00
2. U9 = 100 dan U15 = 172. Nilai u11 =

U9=a+8b
100=a+8b

U15=a+14b
172=a+14b

dari persamaan diatas dieliminasi
172=a+14b
100=a+8b
72=6b
b=72/6
b=12

100=a+8b
100=a+(8×12)
100=a+96
a=100-96
a=4

U11=a+10b
U11=4+(10×12)
U11=4+120
U11=124