Jawabanmu

2014-01-16T18:37:35+07:00
25 - 4y = 6y+15
25-15=6y+4y
10=10y
y=10:10
y=1
2014-01-16T18:39:30+07:00
25-4y = 6y + 15
maka 
- 4y - 6y = -25 + 15
-10y = -15
y = -15 dibagi -10
y = 1,5