Jawabanmu

2014-09-06T18:10:58+07:00
3A= 5x+y   6A=10x+2y
2B= x-2y   10B=5x-10y
=(10x+2y)+(5x-10y)
= (10x+5x)+(2y-10y)
=15x-8y
2014-09-06T18:13:07+07:00