Jawabanmu

2014-08-08T18:58:11+07:00
A+5b=12
a = 12-5b

2a+b = 6 2a + b = 6
2(12-5b) + b= 6 2a + 2 = 6
24-10b+b=6 2a=4
24-9b=6 a = 2
-9b=6-24
-9b=-18
b=2