Jawabanmu

2014-02-11T20:04:36+07:00
2014-02-11T20:04:49+07:00
= 1/2y + 5 > 15
= 1/2y +5-5 >15-5
= 1/2y > 10
= 1/2y . 2/1 >10 . 2/1
y = 20